This has awesome sound quality either as a transmitter or receiver. Pairs easily and has very good range. LDAC performance is awesome. BT has finally made it. Shure, range and battery life of the paired unit suffers from LDAC sucking it dry and turning it all into sweet audio performance but the sound is fabulous and worth it. This is so close to direct connect into my HT system that I won't "cable up" again. I am the " Mr Monk" of audio and in my 70s so I know Hi-Fi in and out and this is the highest quality sound I have heard from any wireless technology. Period.

This was pretty easy to set up. The only issue is the is a bit of lag between the music and my wireless speakers.

Item works as intended. I have other Bluetooth transmitter / receivers as well to compare. This works as well or better than those. Easy to use. Seller sent me a message that better explains how it works (without asking) - that's helpful. I had already pretty much knew how this item works (having experience with similar items)... someone who hasn't used a device like this - that instructional message they send (when you receive the item) is very helpful. You can have a stereo (or whatever) connected and running via cable while also transmitting Bluetooth to headphones, earbuds, soundbar, portable stereo, etc etc. That's a nice feature. LDAC transmission does work with LDAC capable headphones. Aptx capable headphones also work (I have a collection of various Bluetooth headphones and earbuds - a couple dozen pair). If your headphones are Aptx Adaptive, set this 1Mii transmitter to Aptx HD. If your headphones only have SBC, set transmitter to Aptx LL. Obviously if you want Aptx LL or HD specifically, set appropriately. I'm not sure which setting (LL or HD) to set if your headphones are the original Aptx (no LL, no HD, no Adaptive - just Aptx). I think I have a set of regular Aptx I can try out. If I do, I'll edit this review. It's one of the other settings. There was an instance where one of my earbuds sets wouldn't connect to this device - I have the same issue with that particular set of earbuds connecting to any of my transmitter / receivers...so I think it's and issue with the earbuds and not and issue with this device. The other sets connect without issue. So there's a slim chance your particular headphones won't connect. The set I have with issues with is a budget set of earbuds...that have connectivity issues with other devices such as my Fire Stick 4 max. Here's an FYI - I hope this doesn't sound too convoluted lol ------ sometimes (depending on your headphones) --- in some instances (not always -depending...) if your headphones / earbuds have LDAC capability, and want use them in LDAC, but were set to another codec prior (such as SBC) last time they were used (for example, I sometimes change my headphones from LDAC to SBC to save battery - by changing codecs either in my Headphones App, or "Developer Options" on Android or using my Bluetooth Codec changer App) - you may have to manually change the headphones back to LDAC in the headphones App / Developer Options / Codec App for them to engage LDAC mode... of course also selecting LDAC on the Transmitter/ Receiver. Your set may not need to be manually changed prior to use with this device. It may simply change codecs depending on the selection of the transmitter/ receiver device....i have tried doing it that way and some of my headphones do respond...meaning they change codecs based on the selection of this 1mii device....but not with all headphones...they need to be manually changed prior to use. So there are caveats to all this depending. It's not complicated. Just be mindful. Again, the headphones I did have connection issues (meaning they wouldn't connect at all to this device) have issues connected to other devices that aren't my phone. So it's not the fault of this 1mii device. As for range and stable connection - it does have stable connectivity and seems to reach a decent distance. I don't have exact figures, but it's range is much better then my phone for sure. Anyway, so far, this item works as intended and I'm happy with it. If anything else comes to mind, I'll add it later. The following is just a "wish" for an item that doesn't exist (not to my knowledge - I've looked) --- If anyone from 1Mii happens to read this -FIRST - please bring back the more premium transmitter/ receiver model you had - or maybe something similar. I almost bought it, but waited. Now it's not available . OR - please develop a model with not only Bluetooth transmit and receive, with Aptx and LDAC, but also with an upgraded DAC chipset that upscales the sound. I believe the model you had discontinued had all that. There's very few such items in the market.*** Additionally, PLEASE PLEASE develop a headphone amp, with the premium DAC and the Aptx & LDAC capabilities - also with Bluetooth receive... and even add Bluetooth transmit capabilities - that would be even better.There's a market for people who want to use wired headphones - high ohm premium headphones that require an amp - plugged into a wireless receiver...to watch TV or listen to music thru the TV or from a stereo. There are similar products out there, but they are usually missing something...they may have an amp with wireless receiver, but no upgraded DAC chipset...or they have the wireless and DAC chipset, but no amp...or they have all that, but no LDAC capabilities...I want something with all that built into one unit. There may something similar with Bluetooth receive, but not also with transmit. I have a device with all that above (Aptx, LDAC, Bluetooth transmit and receive, upscaling DAC chipset) --- but no headphone amplifier. So I have to hook that unit up to a separate amp. I really could use all of those options in one unit. I also use the transmitter option of that other unit to use my headphones off it. That unit is in a different room than my 1mii device. Anyway, that's my dream device. I'm sure there's other out there that also would love such an all inclusive device.

ATTENTION! My review was for the model containing an ESS dac chip.Update: Although this is a great product I have since then bought a better DAC for my purposes. It's main difference in the DAC strategy I have found is that It kills off some reverb affecting the stereo imaging overall. It seems to sacrifice some of the low mids to give it a "clarity?" . This ends up making vocals more nasal than chesty and kills some symbal splash and tom decay. Still a great inexpensive way to get optical to RCA for vintage gear. Still recommend it at it's price point. I am still running them as Dacs in my kitchen and cinema setup to vintage integrateds.As DACs I recommend the sound of the Echo Link with cirrus logic chip and Cambridge Audio DacMagic 200M. I reviewed those producst favorably as well.I actually have 3 of these units. I bought them to get bluetooth to my 2 vintage stereo Rotel's.Here are a few things I can shed light on in case anyone has questions. I am running them from my Hard drive connected to an old WDTV unit. I initially had RCA outs to my Rotel from WDTV unit but now I am running Digital Optical out to the b03 from the WDTV then the headphone to RCA cables to my Rotel.I compared the direct RCA out with the B03 output and have to say the ESS DAC definitely upscaled my signal. The RCA direct our from my WDTV lacks frequencies compared to the out of the B03. Big Win on that!!Volume + and - controls affect the volume output via the jack to RCA. When I first compared I thought it was automatically line level but you can increase the volume to max with the + and - controls. they are not just for bluetooth. I dont think anyone covered these few points!!I was powering both B03 units from USB ports from TV or Cable box...DO NOT Do That!! USE THE WALL WART TO PREVENT NOISY USB POWER. I was disappointed that the units were noisy until I plugged them to my power bar. Dead silent now and great performance.For 100$ the DAC works well. Bluetooth connects well and all. It solved my connectivity issues for my oldschool stereos. Why would I do that? Old school qualioty stereo units outplay a lot of disposable new stuff. Look into it and see. Enjoy your music! Life is too short for sound you dont like!!

Faulty transmitting to apple airpod 2nd generation.

First impression: Easy to setup out of the box. The packaging is good and the supplied cables and power supply are nice extras. I like the design of the item. I think it looks better than other brands.Connecting: The initial connection with my earphones was quite easy and quick. No issues. I can switch between Aptx LL and HD modes on the fly.Range: With direct line of sight, I can walk 15 feet from the base and have no problems. Add in a wall, a little less.Sound quality: The Aptx HD option certainly works.I bought this unit with my own money. This is not a sponsored review. I will update of my first impression changes.

This is very good . I bought it in the hope that it would transmit and receive at the same time but it can only be one or the other . To be fair I’m not sure if any product can be both at the same time. It works very well as either a transmitter or receiver.

I love this bluetooth receiver and transmitter it's very simple to use and the audio quality is super good I strongly recommend anyone thinking about buying this device.

I bought this product back in March 2019 and have been using it pretty regularly. I primarily utilize the transmit mode on the device to listen to TV when everyone's asleep to not wake up the family. Overall, the product is awesome! I linked this with my Bluetooth Beats Audio Studio Headphones and have not had any issues since pairing them. Initially pairing can take a while which is probably the only flaw I have with the product. It took me about 15-20 minutes of trying multiple times to finally get them to pair. Only was an issue with the Beats, as I have a pair of Jabra Elite Bluetooth headphones which paired within a minute or so. Once the beats finally paired, repairing is very quick and easy (within a minute max). So I can certainly live with the initial issues.Set Up: Hooking up everything was very easy, I actually utilized a different Optical cord than what was provided in the box as I plugged it into my soundbar and needed a longer cable to reach. I ended up mounting the device behind my TV and since the device is fairly small, cant even see it when I push the TV back in front of the Device.Range: No complaints at all! Range is great, I can go about 60-75 ft from the device and still have a good, strong connection. Since my device is placed behind my TV I lose some range so if you had it open and clear of any obstructions, I am sure you can get much more. Probably one of the best long range transmitters I have utilized (much better then the Avantree Long Range transmitter I have upstairs)Sound quality is great and so is the sync. Never had any issues with the sound not being synced with the the video and the quality is great, no complaints at all.Overall, highly recommend this product to anyone looking for a good Bluetooth transmitter. Only con was that it took about 15 minutes to connect my Beats headphones but this issue could be specific to beats as my Jabras connected just fine initially. The company's customer service is also really good, only downside is I think they are located in China so communication can only occur via email and it may take them about 5-10 hours to reply depending on the time of day you send the email. But they are very helpful!