A part of the review has been auto-translated.
The device works great! It has a clear sound, surprisingly good for this price, with no hiss, no noise, just clear, beautiful sound, and even a pretty decent bass. I've mounted it inside a small box with external connectors for speakers and power and couple of buttons for BT switch and power switch. I use it to drive a pair of really old and gorgeous speakers (40 years old speakers) and they sound great! I use an external switching power supply of 12V and 2A (since the speakers are rated just below 15W). I can't stress it again, it really sounds great!
It’s a nice compact amplifier. But there is a mistake with the silkscreen on the speaker output terminals. One channel is labeled backwards so the speaker will be out of phase. See the photo showing the correct labels. Also most Chinese Bluetooth receivers have an annoying loud start up jingle. As does this one.