Battery: Built-in lithium battery. Rechargeable via USBMaterial: ABS & spongeWeight: About 45gSize: Abut 5.5 x 8 x 5.5cmCharging time: the first charge at least 2 hoursStandby time: 6 hoursTurn ON/OFF: in sound head with "OFF - ON" button， uncover cavernosum have a switchNOTE:Please be sure to turn off switch on the speaker when chargering.