TROND Bluetooth Transmitter Receiver V5.0, Bluetooth Audio Transmitter

2-in-1 Bluetooth Adapter for TV/Car/ PC/ MP3/ Headphones/Home Stereo/ Speaker, AptX Low Latency, Pairs 2 Devices Simultaneously

Brand TROND
Connectivity Technology Wireless, Bluetooth 5.0, 3.5mm Jack / AUX / RCA
Compatible Devices Television
Connector Type AUX / RCA
Audio Encoding Stereo
Audio Output Mode stereo
Color Black
Item Dimensions LxWxH 1.8 x 1.3 x 0.38 inches
Item Weight 0.5 Ounces
Number of Channels 2
  • AptX & AptX Low Latency - Powered by premium CSR8670 chipset, TROND 2-in-1 Wireless Audio Transmitter & Receiver supports aptX & aptX Low Latency in both TX and RX mode. You can watch movies while listening to wireless audio in a synchronized fashion and without any noticeable audio delay
  • TX Transmitter Mode - TROND BT-DUO transmit stereo audio wirelessly from your non-Bluetooth audio sources such as TV, MP3, CD player, PC or eBook reader to your Bluetooth-enabled headphones, speaker or receiver. Enable you enjoy high quality music wirelessly without disturbing others. Note: Bluetooth adapter without volume control button
  • RX Receiver Mode - The Bluetooth adapter offers an economical solution by turning your old wired headphones or speakers into Bluetooth headphones or speakers. Now, you can enjoy CD-like audio quality wirelessly on your home stereo or wired speaker. Charging while working, the built-in battery could support the Bluetooth adapter to work for 8-10 hours per full charge
  • Dual Stream & Multipoint - In the TX mode, TROND Bluetooth transmitter can be paired to two BT Headphones or speakers, and streams audio to both of them simultaneously. In the RX mode, it can be paired to two phones or tablets, but it can only receive the audio from one of the two paired devices. Please note that the codec would be downgraded to SBC when pairing to two BT devices simultaneously
  • Compact Design & Carry Anywhere - Bluetooth transmitter for tv, weights only 0.5oz, some round shape body, has good compatibility with most Bluetooth headphones. Easy to be store at home home and carry in road trip or flight to enjoy music. Note: The bluetooth adapter actually only RX-mode can be used in the car
Product introduction
Comment And Reviews
I use it for listening to tv in my living room. It seems to be a little finaky. Pushing the button has a somewhat delayed activation time. I have not tried it anyplace other than my living room. It wouldn’t hurt to have a little more range.in a nutshell, it does what I need it to do.
Review of the following two items purchased together:

Tx/Rx: TROND Bluetooth V4.1 Transmitter Receiver / Wireless 3.5mm Audio Adapter with aptX Low Latency & aptX for Both TX & RX, Dual Stream and Volume Controller

Rx: TROND 3.5mm Bluetooth V4.2 Audio Receiver Adapter with AptX Low Latency & Volume Control, for Home Stereo, Wired Headphones & Speakers

Both are 5 stars IMO. Here’s what I was looking for and what I found:

Main objective: Use a BT receiver to allow me to use wired high quality headphones (Sennheiser HD650, HD598, HD555 mod to 595) with BT enabled devices (TV, computers, iPhone 7+, iPods and iPads) and secondary objective of using wired headphones with non-BT enabled legacy devices (iPod classic, older TVs)

Why? Good quality BT enabled headphones are expensive and have a limited frequency range (Bose QC35 $349, and Sennheiser HD-1 Wireless $499, 28 ohm impedance, 16-22000 Hz) compared to higher quality headsets (Sennheiser HD650 300 ohm impedance, 10-41000Hz; HD598 50 ohm, 12-38,500 Hz, HD280 64 ohm, 8-25000 Hz). Even though BT has improved up to BT 4.2 and codecs for sound transmission have improved to decrease latency and transmit a broader range of frequencies, it is still cheaper to convert wired headset to BT capability at the inconvenience of managing a dangling cable. I don’t expect the BT transmission to have the same quality as a headphone wired directly to a receiver or iPhone/iPod/iPad

Why did I purchase both?

a. Reviews of many bluetooth (BT) receivers (Rx) used to drive headphones reported lag between video and audio. I wanted the receiver, but if there was going to be lag, then I’d pair the Rx/Tx with the Rx to see if that helped. I looked for low latency drivers.

b. For non-BT devices (old iPod classic, non BT TV, I needed a BT Tx, so a combo Rx/Tx made sense.

What features were I looking for?

a. Volume control on the Rx. Why? because the wired headphones don’t have volume control unless I put a volume control between them and the Rx. Samsung Series 6 600D and Series 7 700D UHDTVs with BT don’t provide volume control using the TV remote; therefore the receiving end of the BT Rx has to control the volume.

b. Most up to date BT 4.1 or 4.2 so that it maintains backwards compatibility with other BT units (not all BT are the same — i.e. my iPhone 7+ can pair to a Jaybird Freedom, but my iWatch series 2 won’t pair with the Jaybird Freedom).

My intended uses:

1. Pair Bluetooth TV to Rx connected to headphone, if there is latency, then connect Rx/Tx to TV RCA outs and pair Rx/Tx to Rx connected to headphone

2. Pair iPads/iPhone/iPod blue tooth to Rx/Tx in Rx mode or Rx connected to headphone

3. Pair Rx/Tx to Rx connected to headphone

DESIGN.

Both have the same small form factor, plastic box except the Rx has an on off sliding switch rather than just a single button that has to be held 3 seconds to turn it on. Rx/Tx no sliding on off switch, just a button that has to be held down 3 seconds.

EASE OF CONNECTION:

Charged both fully. Tx/Rx set to Tx and turned on, Rx turned on 1st time and they paired within 5-10 seconds. Tx/Rx goes to solid blue; Rx goes to LED off blinking blue every 10 seconds instead of solid blue to indicate connection. No I can connect any nonBT device (TV, older iPods, iPod Classic) via male to male 1/8” plug to the Tx/Rx set to Tx mode and headphone connected to Rx and I have a functioning BT system. I just wrap the headphone cords up with velcro and put it on one side of the headband … looks geeky but I’m using it for function, not looks.

To set either unit to pair, just double tap the “power button” and they immediately blink red blue red blue until paired. Once paired, Tx/Rx light goes to solid blue, Rx blinks blue every 10 seconds. Even if a connection is active, the double tap “power button” breaks the connection and sets the units to pair mode. Pairing is quick.

Pairing to Samsung 600D, 700D UHDTV is easy. Go to Menu Settings > Audio > Select Speaker > Bluetooth. The Trond unit will show up no screen, select pair and it’s done in 5 seconds. Volume control is on the Trond unit; Samsung remote cannot control volume from TV. NO LATENCY on both TVs to Rx/Tx or Rx. Very nice. Don’t need to implement the Rx/Tx —> Rx method. This gives me a BT Rx for each TV now.

Caveat, iWatch series 2 cannot pair to either Trond Rx/Tx set to Rx mode or Trond Rx. But iWatch series 2 cannot pair to Jaybird Freedom BT earphone. iPhone 7+ pairs to Tronds and Jaybird Freedom BT and work without problems. This seems to be more of a problem with the iWatch than the Trond units.

DROP OFFS and DISTANCE:
Connection good to HDTV BT 30 feet away unobstructed. No drops offs of signal or loss of connection with iPhone in pants pocket and received on opposite side of my head indoors. Haven’t tested outdoors where BT can’t bounce off walls. Intermittent breakup when BT Rx separated from BT Tx by a floor (i.e. receiver on 1st floor, Tx in basement, but of course it gets better when I’m standing 1 floor immediately above the Tx in the basement).

If paired to iPhone 7+ and I turn on the car to which the 7+ is paired, the Trond connection shuts off and the car and 7+ become paired to give priority to car-phone handsfree connection. Trond doesn’t have a speaker and can’t be used for answering calls (which is not what I got this for).

SOUND QUALITY:

No lag from Samsung UHDTV Series 6 and Series 7 using the TVs BT. No audio-video lag between TV and Trond Rx, iPad and Trond Rx playing movies on Amazon Prime and Youtube.

Sound quality depends upon type of headphone connected to Rx, but the Rx and Rx/Tx can both drive a 300 ohm impedance Sennheiser HD650 without problem. (Avantree Quick Clip reportedly has a hiss and can’t drive anything more than 32 ohm from what I’ve seen on reviews on Amazon).

The sound quality (frequency spread) is not as wide as wiring the HD650 directly to my iPod classic, but it’s almost as good (i.e. like listening to an MP3 at 320 kbps instead of a lossless MP4/M4A at up to 1444 kbps sampling). I use MP4 lossless music files as I can hear the difference in quality between 1444 kbps sampling MP4/WAV and MP3 320 kbps max. I am very satisfied with the BT performance from iPhone 7+ to Trond Rx to HD650, and iPod Classic to Trond Rx/Tx to Trond Rx to HD650. Even though reviews say an HD650 is best used with an external amp, I have been more than satisfied with the performance with an un-ampped HD650 driven by an iPod classic or iPhone 7+ lightning to 1/8” plug given the type of recordings I use (which are much better than the 128 kbps stuff found off of iTunes music store … the stuff that many are satisfied using less refined headsets and earbuds).

Works just fine with the other HD598, HD 555 mod to HD 595, so it should work just fine with anything lesser. Even the slightly truncated sound of the Tx/Rx to HD650 is still better than any of the other headsets. Wired is always better than BT, but BT is getting close. Other specs:

HD280 8-25000 Hz, 64 ohm impedance
HD555 12-38599 Hz
HD598 12-38500 Hz, 50 ohm
HD650 10-39500 Hz, 300 ohm

HD1 16-22000 Hz, 28 ohm; this is Sennheiser’s $499 BT headset

Bose QC35 $349, QC2, QC3 — I can’t find specs on these, but the Trond’s drive my QC3 just fine. Haven’t tested QC2 and of course the QC35 doesn’t need this. In general, Bose headphones tend to muddy the mids and are thus more bass heavy than balanced headphones.

Sennheiser HD700 8-44000 Hz, 150 ohm, $419
Sennheiser HD800 19-44900 Hz, 300 ohm, $990

I’d rather spend my money on an HD700 than on the $499 HD1, so the Trond BT are a workable solution for me. If they can drive the HD650, I’d anticipate it should do just as well with an HD700.
Things I haven’t tested:

I haven’t tried the Rx/Tx bind to two Rx to drive two headphones, but this is what would be needed to drive 2 headsets from one TV. I haven’t tested how week the signal would get from an Rx connected to a 1/8” splitter to drive two headsets.

FINAL THOUGHTS:

1. Trond Rx/Tx and Rx are both 5 star.
2. BT pairing is easy, quick and simple.
3. No lag between audio and video from Samsung UHDTV BT to either Trond unit.
4. Trond Rx able to drive 300 ohm Senheisser HD650 without hiss
5. Less cost than the Avantree Quick Clipper Pro and Priva III (which I considered prior to purchasing these). Reportedly the Clipper can’t drive anything >32ohm per specs.

If you don’t need a BT Tx, then I’d just buy the $20 Trond BT Rx. If you want flexibility, then get the Trond BT Rx/Tx with volume control which are $37 as of 3/20/2017. Even though iPhone and iPod Classic can control the volume transmitted to the Rx, the Samsung TVs don’t; therefore, I wouldn’t get the BT Rx/Tx without volume control or volume at the headset will be loud unless you put a volume control between the Rx and the headset plug.

3/24/2017 Update:

I liked these so much, I bought another pair of Tx/Rx and Rx. Amazon had a lightning deal on the Tx/Rx for around $25. Great deal.

To get them to initially pair, make sure no other BT devices are on. I couldn’t get them to pair initially when my BT Samsung UHDTV was on because the TV seems to automatically pair to devices like this. Once I turned off the TV, I could get the Rx/Tx to pair to the Rx. After that, pairing was quick as long as the two were in near contact with each other though other BT devices were on.

Update: 4/10/2017

When using these with a sensitive, low impedence in ear monitor -- Shure PTH500/530, there is background noise when played at low levels; the Shure can play really loud at a lower volume setting than >50ohm impedance headphones (i.e. No low level noise using Sennheiser HD280 (64 ohm), HD 555/598 (50 ohm), HD 700 (150 ohm), and HD 650 (300 ohm).

Paired to Samsung Series 6/7 UHDTVs as well has headphone output on a Yamaha RX-3060 receiver running a connected BluRay, I find no lag between audio and visual, even after putting the movie through various digital signal processes on the Yamaha.
Very useful, you can connect and listen to (2) two different sets of Bluetooth earbuds/headphones or speakers and the same time. Turns wired headsets into Bluetooth headsets. Good sound quality, and easy to use and set up.
3rd update Mar 20, 2019:

Updating my previous, original 2-star rating to 5 stars thanks to their support given and a fully functional replacement device in ~2 weeks.

--- TL;DR ---
My initial experience from Sep 2018 with my DUO was mixed. I didn’t contacted support, and wrote my first “quick review” on Dec 2018 or Jan 2019. On Feb 2019 I got contacted by a person from support because my review.
Since then, the support person ’greatly explained’ the causes of the issue and guided through the process for getting a warranty device.
I’m very placed with the detailed support given by him, and new replacement device works great!

--- Device ---

My issue from Sep 2018 while RX mode was indeed a defect on some units on the Amazon warehouse from that period, which occurred in any codec (SBC, aptX and aptX LL).

The TX “issue” of audio fading/cutting on low volume (e.g. while playing on Nintendo Switch on low noise scenes), is normal. One must turn all the volume up on the audio source so the device can capture it, as the chip isn’t an amplifier but just a transmitter.

Due the RX issue, I was offered replacement device. Decided to try and upgrade to the Trond DUO S. Now I can confirm the intended correct functionality of RX/TX on both devices (DUO and DUO S), and confirmed the RX firmware defect.

Additionally, I could test pairing a DUO with a DUO S. They work amazing on aptX LL (Low Latency) which is selected automatically as it’s the best codec available on both. You can easily see and hear the difference between the standard SBC and aptX LL, the latter feeling instantaneous on audio visual feedbacks.

After 5 months of use and having a fully functional unit...
Re-viewed PROS:
- Compact goodness.
- Good battery duration, easy charging, and can be left connected.
- Easy pairing, even multiple pairing (after you get the “trick” for pairing).
- Lot of adapters included.
- Long satisfaction warranty (18 months) and great support service.

Re-viewed CONS:
- No configurable low-battery audio signal. It can confuse you from phone alerts, etc.
- No configurable LED.

--- Support and warranty ---

They are serious on their support area, as they followed me up some time latter from my original 2 stars Amazon review on all my emails until I got the issue solved (on my case a warranty applied, until I had it on my hands, even though it would need a global shipment).

They DO respect their “18-MONTH TROND warranty” additionally from the Amazon return period, so you can buy with confidence that any defect will be followed quickly and in great detail. This was getting replied the next day and getting detailed explanations of the cause(s) of my issue along with the possible actions to take.

Big thumbs up for Trond. They managed to stand up with the pesky support processes of many other bigger companies out there.

--- MISC ---

My only complaint could be their webpage. Before making my original purchase, I looked up their website and it feels empty and outdated, like if they didn’t exist nor could give any kind of quality support in case you got into issues. They deserve a newer and better site that shows and highlights their great client support.

-------------------------------

2nd update Feb 22, 2019:

Their customer service contacted me regarding the issues I mentioned here, trying to help me with them by proposing a replacement thanks the 18-month warranty.
I will try keep updating this review accordingly.

------------------------

1st Original review:

Has been some time that I got this (Sep. 2018) and have been postponing a quick review, some thoughts on this device.

I have used a few times on various scenarios (playing on Nintendo Switch, video watching, etc., with different headphones as receivers, and different controlled sources as high end phones and laptops).

Personal cons:
- 1 issue as a receiver.
The device is identified as apt-X on my phones, but the output audio is awful, sounds muffled, as phone call quality on all devices that I tried.
This reaches the point that the Windows 10 ”bells sound” sound test gets very pitchy and gets highly distorted and the very end of the last bells. I would like to provide an example of this by recording the output from the Trond when used as receiver.
- 1 issue when transmitting.
When transmitting, the quality is pretty good, BUT, when having low volume sounds coming from the audio source, the Trond seems to ”fade” or cut-out the audio.
Playing games on the Nintendo Switch is not enjoyable with some games that have some low-volume scenes, since those are intermittently faded or cutted-out. There is no noticeable delay at least from what I can tell (but at this point I just stopped using the Trond both as receiver and transmitter).
(As I said, the quality is great when transmitting, but not sure if it’s real aptX quality grade, my headphones don’t have any indicators of what protocol is being used when receiving audio from the Trond when it’s transmitting, neither Windows helps with this).

Pros:
- Super compact, portable.
- Portable power of ~6 hrs or more.
- Quicker setup as receiver.
- Can be used always connected

Note that I probably got a defective device but.... Anyways, I stopped using it since then (Sep. 2018). It has just a couple of days of usage. Recently I got the time use it again but as a background music receiver, as the previously mentioned issues are just annoying.
The receiver sound quality is the dealbreaker for me.
Maybe is normal for the price, just the aptX is there for the short delay feature of the protocol.
purchased 2 of these to trasmit sound from Quest 2 VR headset to our surround sound system. Wanted to fill the room with beat saber music, as the on-board speakers are just OK as far as volume.

Works great for playing beat saber. No noticeable latency, important since the game requires matching the audible rythem to moving visual input. The sound quality is still just OK, but that’s largely due to the already compressed sound output in my application.

That being said, i doubt most people will consider these worth the price for most applications. as other reviewers have stated, quieter ambient sounds are cut to silence, only heard when louder sounds occur over top of the environmental baseline. this is a poor experience for immersive gaming or movies, and will also be terrible for any misic that has subtlety.
If you watch a film/video at a comfortable volume setting it constantly mutes scenes on scenes with only quiet background/ambience, or even quiet music, destroys the atmosphere the makers were trying to create.

The clincher was trying to watch the blu-ray of Aliens which has a very dynamic DTS soundtrack (mixed to 2.0, obviously) - the title and end themes consisting of very quiet violins and eerie wind-like sounds, and dozens of scenes with only ambience noise, footsteps and such, disappear unless you crank the volume on the input device (a PC USB soundcard in this case) right up.

I ran some tests with an audio editor and the range from just below the Trond clipping/distorting (i.e. ’full scale’) down to where it mutes is ***49dB***!!!! That’s a ***6-bit***dynamic range (as compared to the 14+ bits / 90+dB even cheapest audio gear usually manages)! To put that in perspective, cassette tapes without NR had hiss at c. -55dB.

People who only listen to monotonously loud music to create a ”wall of sound” when they’re out-and-about might never notice it, but it’s totally unfit for anything remotely like ’critical listening’ such as .... watching a movie.

ETA >>
I returned the Trond and just received an Avantree Oasis (twice the price of this one) in the faint hope it might be better. Ran the same tests and it isn’t - very marginal improvement of 1-2 dB, but the same muting at low volume.

So there we have it - APTX-LL’s dirty little secret.

The fast encoding/decoding (hence low latency/lag) is achieved by massively truncating the bit-depth (the amount of data to process) to around 6 bits, or if you like simply throwing away 8-10 bits of the 14-16 bits that most software and hardware operate at. I reckon the old adage ”there’s no such thing a free lunch” was never more apposite.

There is no acknowledgment of this very serious limitation anywhere online that I can find, no-one seems to have run the simple tests that reveal it, and even more oddly very few people have simply NOTICED it when listening.
I was a bit concerned about buying this product. A few online articles made the process of Bluetooth enabling your tv rather complicated and I’m no techie! Also £25 for a gamble seemed quite a lot.

I needn’t of worried. The setting up and pairing couldn’t have been more straightforward. It worked first time. Amazing. Online articles say that latency - ie headphone sound synchronised with tv sound (get me, I suddenly give appearance of knowing what I’m talking about), can be a problem. Not with this device - everything synchronised fine.

The device plugs into the audio out sockets on the tv (whilst still retaining tv speaker output) and is tiny. Now my partner doesn’t need to be blasted out the room with the high tv volume that I need sometimes, I can dispense with subtitles, and I can even listen to American films where sometimes a drawling accent makes it impossible to follow.
This review refers to TROND 2-in-1 Bluetooth V5.0 Transmitter Receiver/Wireless 3.5mm Audio Adapter.
Not so much a product defect as a warning to prospective buyers - check the device you intend to use this with supports ”Aptx LL”. If (like my Sony WH-H900N headphones) they state just ”Apx” then you WILL have a noticeable lag between video and audio, its actually 0.12s but makes a massive difference, anything with dialog is really unwatchable. Aptx LL reduces the delay to 0.04s and I confess I haven’t tried that, but if you only have Aptx then save your money, this won’t be usable. This IS stated on the posting for the device, but you have to search for it, and I confess I did not at first realise the difference that little ”LL” bit makes!
Without doubt one of the best last minute purchases I’ve made. I needed a device to let me listen to in flight movies on a plane using my Apple AirPod Pro Bluetooth headphones.

This device delivers on that basic usage perfectly. I put my AirPod case in pairing mode, turned on the Trond transmitter by pressing the single button for 3 seconds, and quickly the two were paired. This was indicated by the flashing red/blue light ring around the power button turning to blue. Put the AirPods in my ears and they connect immediately.

Connecting options are a male to male 3.5mm jack or a male to male 3.5mm jack cable. Plug in to flight arm rest, power on the Trond device, AirPods in ears and immediately your are listening to in flight audio. I used for 8.5 hour flight and only charged it briefly from the in flight USB port also while listening. My AirPods needed charging long before this would have ran out!!

There’s a switch to allow Transmit or Receive mode. Device itself is small as shown, plastic has that slightly rubber quality feel to it. Box is simple card, and the 8 page English instructions easy to follow.
I was trying to do something quite specific with this so my negative review should not put people off who want to do obvious things like listen to music on Bluetooth headphones cast from their standard phono HiFi setup. I do however wonder if people who are hoping to cast TV audio output to Bluetooth devices need to think twice before proceeding. More below. My negativity is as much about the inherent limitations of Bluetooth as about this particular product.

My requirement was to cast the phono output from a laptop connected USB audio interface to my B&O Beolit 20 so I could achieve full portability of my amp modelling software guitar rig. The beauty of the Beolit for this purpose would have been not just its very high-quality audio but its long rechargeable battery life and rugged constitution. However, I was greatly nonplussed to discover that though this device was able to cast the guitar signal but that there was a good half-second lag between hitting a string and the sound turning up on my Bluetooth receiver. Closer investigation revealed that this device implements the latest Apt-X low-latency protocol as part of Bluetooth version 5, but that this is only activated if the receiver at the other end is also Apt-X capable (meaning at least but not necessarily Bluetooth 5.0). So, disappointment reigned. As a guitar setup this was useless. This is also why I wonder if customers wanting to cast Bluetooth from TV audio might not be similarly disappointed. Unless their receivers also implement the latest Bluetooth 5.0 with Apt-X they are in for a frustrating lip-syncing experiencing.

I just feel that the Amazon product page for this device and similar ones should make it much clearer, in very big, luminous flashing letters, that interoperability with other devices which are lag dependent is dependent on this compatibility, namely Bluetooth 5.0 with Apt-X. Of course, if all one has ever used Bluetooth for up to now is for listening to disc or MP3 players the lag issue would never have been noticed. Who can tell that what one hears in one’s ears is half a second behind what’s being read from the media? I would guess that maybe half of disappointed users would just give up nonplussed while the other half would investigate to discover the compatibility issue. Of those, maybe half would fork out for the latest headphones or receivers to restore proper lip-syncing.

An additional issue with this particular unit was that while it paired up with my (non-portable) Yamaha CRX HiFi it failed to pair with the Beolit. Thus, even without the lag issue this item would not have fulfilled my original purpose. The fact that these devices have no visual display to present pairing options or switch to select them means that they just inevitably pair with whatever locks on to it the fastest. This is a bit sub-optimal.

I am very grateful that Amazon handled my return of the unit, despite the package being opened, without quibble.

There is as yet no way to get my guitar signal out on to a Bluetooth receiver or even just a fully portable, by which I mean rechargeable, reasonably transparent audio amplifier. There are plenty of, typically small, tinny and more or less horrible portable guitar amps out there, but they all have their own acoustic characteristics that just get in the way of and otherwise ruin the glorious sounds coming out of my laptop’s modelling software.