ETvalley Foldable Keyboard, Ultra-Thin Wireless Keyboard for iOS/Android/Microsoft System PC Tablet Smartphone, QWERTY Keyboard, USB Rechargeable&mdash;Silver Made of strong and lightweight aluminum alloy for comfortable touch. Foldable design, easy to carry in business travel USB rechargeable (USB cable included) Compatible with IOS, Android and Windows systems. Folding size: 5.5 *3.5 * 10.6 inches; open size: 9.8*3.9 inches