1.Support reading MP3 music in U disk and TF small memory card; 2.Built-in Bluetooth receiving function, can receive Bluetooth music from mobile phones; 3.For 12V battery, can be with DC15V charger,(suggest 15V/2A) 4.With AUX IN external audio input function, can be connected to the computer to play; 5.The panel has a microphone, which can be used to sing. 6.Using power amplifier, rated power 50W, 80W; 7.Size: 220x88MM 8.The product is mono channel. Colour:black Material:plastic Package Contents: 1 x Amplifier Board Only the above package content, other products are not included. Note: Light reflection 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.