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

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.

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.

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.

The Bluetooth on this guy is great. I have it set up in my shed and I can walk to the front of my house and it still plays clear.

I have an outdoor speaker system attached to a stereo inside, I ran a red and white audio cable to the yard in order to be able to plug in an adapter for headphone jack use for people's iphones and ipods and such, but with protective cases, many of these cables didn't fit without taking the case off, or whoever was playing music had to leave their phone. This device plugs in to the cable, needs a power source either usb or outlet which the cable and adapter is included, and is very simple to pair. Just press the silver button on top until it flashes and stores up to 5 devices allowing you to play anywhere within a pretty decent range of the device, so perfect for hanging in the yard or by the pool and able to check messages and use phone and change music instead of walking over to the device. I highly reccommend if you are in need of a bluetooth device to attach to a white and red cable.

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.

Overall good build quality. Audio quality sounds like Bluetooth should, no noise or static. I tested this out in the garage and the distance can actually go quite a bit more than what is listed. I was able to go about 80 or 90 feet away outside of the garage raising my phone up to keep objects from blocking it. When close to ground level where there is a lot of object blocking it, it ranges between about 25 to 40 feet. This is the second product I bought from UGREEN and I am pleased with both of them, not afraid to buy another product from them. Package comes with charging cable and 3.5mm aux cable. There is no RCA cables or wall charger included.

Works well some of the time. We use it in the gym at work and it has trouble coping with multiple users. You sometimes have to ask the last person to disconnect their Bluetooth before it will re-pair with another device. No RCA cables. Sound quality is good enough for our average speaker set up. Update: stopped working after 6 months. ....but I actually upgraded the stars from three to four. The customer service was amazing and within 48 hours of my initial inquiry, UGreen has sent out a new unit.