Wireless Bluetooth physical keyboard -Bluetooth Version: 2.0 -Battery : Built-in Rechangeable 35MA Li-on battery -CE,FCC,ROHS certificated -Embedded wireless Bluetooth physical keyboard -Medical grade silicon giving super protection for your tablet PC  -Operating distance: 0 - 10 m -Power : Charges by USB -Stylish, thin and lightweight. Half as thin as most folios for the tablet PC