Review on Aideepen TDA7492P Bluetooth Amplifier Board with AC Adapter - 50W+50W Dual Channel Wireless Digital Stereo Receiver AMP Board by Heidi Greenwood

When you turn it on there is a chime that plays at almost maximum volume. It's really annoying and disruptive indoors. In addition, every time you press a button (even if you adjust the volume from your device), a very loud sound is played through the speaker. Startup sounds and button presses are terrible. There is another very similar module on Revain that claims not to have these sounds, PLUS it has a line jack, PLUS it includes an acrylic body kit, PLUS it's six bucks less. (search Revain for "Bluetooth Amplifier DAMGOO Headphone Protective”)