1)Bluetooth 3.0interface 2)oprating current:4MA 3)oprating voltage:3.7V 4)Li-ion battery capacity:280mAH 5)Sleeping current:200uA 6)charging current:200mA 7)charge time:2Hours 8)standby time:90days 9)uninterruped working time:100hours : 10)SIZE:24*12.5*0.6CM 11)weight: 150G 12) have 84 play key 13) can fit for with PU case or use with ipad 2 ipad3, have smart cover fuction, and can remove the keyboard ,