1. Support reading MP3 music in U disk and TF small memory card2. Built-in Bluetooth receiving function, can receive Bluetooth music from mobile phones3. For 3.7V lithium battery, can be with DC5V or 1-2A charger4. With AUX IN external audio input function, can be connected to the computer to play5. The panel has a wired jack, which can be used to sing or singUsing word power amplifier, rated power 15W, 30WThe product is mono channel.NOTE: It must connect a 3.7V lithium battery to open.- -this is very important for power on.Type: Amplifier Boardcolor:BlackMaterial:Metalsize:194 x 85 x 26mmPackage Contents:1 x 3.7V Bluetooth Amplifier board(Without power)1 x Remote Control(with battery)1 x SPeaker Wires1 x radio antennaOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.