Main Features: 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.Using word power amplifier, rated power 40Wx2(80W) NOTE: (VERY IMPORTANT) 1.In normal use, It needs to be connected to the battery, otherwise the board will not work normally. 2.The 12V battery is not include, and power adapter is not include. size: 22 x 8.8CM Material: plastic colour: black Package Contents: 1 x Bluetooth Amplifier Board 1 x Remote Control 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.