Ntech Magnetically Detachable Wireless Bluetooth English Keyboard with Ultra Slim Shell Stand Cover for iPad Mini 4 7.9", Black

Specification: - Built in Lithium polymer battery capacity: 350mah Voltage: 3.7v Input: Micro USB charge cable: 5v Standby time: approx. 30 days. Continual working time: 60-90H Charging time: 2.5h-4.5h Working distance: 10 meters.