UGREENBluetooth AUX Adapter Built-in Battery, Support Dual Pairs Bluetooth 5.3 Receiver for Old Stereo, 3.5mm/ RCA Dual Channel for Home Stereo Speakers

This device works fine. My only complaint is that you have to depress and hold the on/off button for about 4 seconds. It should be one touch for on and off. When it is playing, the button does serve as pause/play, but I think that would rarely be used by anyone. Just make it one touch for on/off.

Product grants what it offers. I connected it to my old model Sony 3+1 home theatre system. I needed a bluetooth adapter to connect that old school sound system to my brand new Nebula projector and i ordered that device. I connected it to the audio output of the bluray player, which also works as the amfi of the system, and it synchronised easily and successfully. No disharmony or discordance between the sound and image. It works really on time. Sound quality is satisfactory however there is a deep noise which is audible when nothing is being played. Once you turn on the sound you don't hear it. Which is quite acceptable for a 11 USD device.

Bluetooth can cut out, but it's rare. Hard to know if it's the rcvr or something with my phone. It does have a friendly voice saying "connected" right before playback.Otherwise, I can say it faithfully connects for hours on end. For best results, don't move the phone around too much during playback. Set it on a table or countertop.I have an older phone used just for music, which sits 2m away on a charger. If there's a problem, it's usually bc the playlist ended or a power spike caused a reboot.This one is best suited for HiFi audio systems using end-to-end RCA cables (wht/red). Mine is hooked up to the input for "CD". Tried "TAPE", but the signal had too little voltage. Any input marked "AUX" should also work well.The single button controls it all; long push to flash the light red/blue (pairing), which also shuts it off after a long press. Once connected, the button acts as play/pause, but no skip function.

My main objection is that this won't reconnect once your transmitting device disconnects (e.g. you go out of range or simply turn off your bluetooth) and then later wants to reconnect -- I have to powercycle it in order to reconnect, which it then does immediately, but it's a pain and plenty of other products don't do this whatsoever.

I have put these on quite a few really old , cheap stereos and sm amplifiers. They have all worked just fine. Great way to stop the children and grandchildren from complaining as much.

Doesn't work well with iPhone 10 but works great with my note 9. For iPhones I think it's very quiet but with mine it is plenty loud enough. Good battery life. Solves a very common problem in using Bluetooth for home theater and many other situations.

I got this in lieu of a pricier unit. I was first really surprised with the sound quality. Very pleased. My only gripe is that there is no charger plug provided. Just a micro to usb cable. My set up is an older Sony Amp that is inside with a pair of outdoor Bose speakers for the patio. I was using an older android phone with Spotify and controlling song selections with my current phone via my wifi network but I had to get up and go inside to adjust volume levels. This solved my problem via Bluetooth and allows volume to be adjusted on my phone. Just the lack of a wall plug is my only knock. Other than that I'm thinking of getting a couple more for a simular issue around the house. For the price, I'm very pleased with it. Also to add, the range of the Bluetooth signal seems to be farther than the advertised 32 feet. With the unit just inside the house, I walked out in the yard about 45 feet or so and it never lost signal.Update :Well, worked great for a few days then stopped connecting. Tried another Bluetooth source and it won't connect to it either. Too bad.. I was really happy with the product and was optimistic about buying another one. I'll be returning this one and try another brand.

Flawless performance - the best feature for me is its working while being charged (who needs that charging for certain applications anyway?) One aspect I would like is to be able to change the description appearing under the Bluetooth devices connectable to the phone. I actually bought and use three of the UGREENs - all have the same not changeable cryptic description on my phone (yes, I realize this is also a function of the operating system; it calls for "industry-wide" solution).