Ok it works but the amplifier quality is super SUPER BAD, you cannot compare it to any regular consumer amplifier, bluetooth works fine and managed to use it without the app, if you use the audio output the quality is not affected with the low rate amplifier. I use it with an old philips component and it works giving it bluetooth connectivity without rewiring everytime, mission acomplished. The app is worthless and ask for an account, with email, phone, address, and whatever not using it. Managed to switch between aux and bluettoth, the last input connected is the one that goes output, so if you want to go back to aux, just plug it off and on again and it works promptly, i guess i wont be able to get rid of the noisy beep that comes with changing input, but now my hifi is bluetooth capable.
Product looks professionally. Comes as kit. DC plug adaptor is not working. Frequency response: Bass is completely absent. With BT connection -3dB at 200Hz; -6dB at 100Hz (measured with resistive load 6ohm). Aux-in is even worse. Far from hifi. For the money a nice toy.