Item type:keyboard bluetooth version: 3.0 lithium-ion battery capacity: 140 mah working voltage: 3.7 v standby current: 0.25 ma working current: less than 3 ma touchpad working current: less than 8.63 ma working distance: less than 15 m button material: abs keyboard layout: 64-key high strength material, strong, long-lasting, wear resistant, excellent typing feel. use with bluetooth enabled devices at home or on the go, suited for windows, android and ios. (touchpad unavailable for ios) work up to 48 hours (560 hours standby) from a single charge with the a18 folding bluetooth keyboard lithium-ion battery. foldable design, easy and convenient to carry.