Review on In-Wall Wireless Music Receiver by Pyle - Home Theater Receiver with In-Wall Audio Control - Bluetooth & NFC Wireless Receiver, Aux (3.5mm) Input - Compatible with Smartphones, Tablets, Laptops, and Computers (Model: PWPBT47) by Stephanie Butler

Great little device. An unreported feature is that the USB port is always on. I have this in my home gym with a small Android tablet in a stand on the wall next to it. This will keep this tablet charged even when it is off. The only downside is that it's better to connect the device when it's disconnected from the amplifier, because when it's off, the noise filters on the cables are also disabled, so you'll hear a popping/humming noise when the device is charging. I wish you could name the BT receiver in it. So when you connect a new device and you have several of these devices, it is easy to select them, but this problem can be easily solved by just turning them on one at a time. I plan to buy a few more of these!