Tektalk Ultrathin Wireless Bluetooth Keyboard for Ipad Air, Ipad 2/3/4, Ipad Mini 1/2, Iphone, Imac, Windows and Android 3.0+ (Ipad Air Cover with Built-in Lithium Battery, White) Adjustable support: Ergonomic tilted design reduces wrist strain. Rechargeable: No battery hassles. Use the USB cable to recharge, even while you type Operating distance: within 10 meters, bluetooth signal is weak in three meters away Auto wake/sleep: Automatically wakes your iPad air when you open the cover and puts it to sleep when closed Package contents: Ultra-Thin Keyboard Cover for iPad Air, USB power charging cable, User guide.