1)bluetooth keyboard for ipad 2)built-in battery with 4000mah capacity 3)auto sleep design 4)fast delivery Wireless keyboard with leather case for ipad Specifications: Capacity: 4000mAh1 ... above charging cycle,2. Hard plastic shell, white color,3. The battery capacity: 5000mah / 18.5 Wh4. Input, mini-USB 5V / 1A ...