... of motion3.Compact design for easy storage or transport4.Gives your chest muscles a more efficient workout5.Also great for building ... Battery inside: (300mA,400mA,500mA,600mA,800mA,1000mA),just for your requirement . * Adopts improved amplifer circuit, produces more dynastic bass;* ... ,3DS/NDSi etc. via Audio in cable; * Ensures the best listening experience for music lovers; Push Up Bulit In Speaker