Astell&Kern AK RM01 Bluetooth Remote Control - Silver Color: Silver / Body material: Aluminum Product size and weight (about): 70mm x 21.4mm x 90mm / (approximately) 123g Physical key: Power Key Mode key / touch keys: return Mute tune forward-song, play / pause Charging method: microUSB 5 Pin / battery: 3.7V 1.100mAh lithium polymer battery Japanese manual included