Lavievert Ultra-Slim Mini Wireless Bluetooth Keyboard Aluminum iPad Mini Cover with Built-in lithium battery for iPad Mini 1 / Retina iPad Mini 2 &ndash; Black Color Outstanding featureLight weightquiet keystrockes,waterproof and dust-proof Rechargeable: No battery hassles. Built-in rechargeable lithium battery lasts for approximately 55 hours percharge. Operating distance: within 10 meters, bluetooth signal is weak in three meters away Special screen key [home] for one touch access to variety of application Package contents: Ultra-thin Keyboard Cover for iPad mini, USB power charging cable, User guide.