Features: 1.Support reading MP3 music in U disk and TF card2.Built-in Bluetooth receiving function,can receive Bluetooth music from mobile phones;3.For 7.4V lithium battery,can be with DC9V/1-3A charger;4.With AUX IN external audio input function,can be connected to the computer to play;5.The panel has a wired jack,which can be used to sing or sing; Using power amplifier,rated power 15W,30W;Description: It must connect a 7.4V battery to open.---this is very important for power on.The positive and negative poles of the battery must be connected according to the this picture,otherwise the board will be burnt.NOTE: (VERY IMPORTANT)Material: plasticcolour: blackPackage Contents: 1 x Bluetooth Amplifier Board1 x Remote Control(randomly style.Cannot be chosen the specific style.)1 x CableOnly 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.