* Powered by#1: DC 5V USB cable * Powered by#2: 1200mah rechargeable li-battery * connect with external speaker or headphone to make sounds * Material: ABS and silicone *Rolls up and folds easily, with a carrying bag for transportation * Simulate standard digital drum, enjoy music fun anytime and anywhere. * 8 demo songs, 5 tones, 3 metronome rhythm