feature: This projection keyboard will work via Bluetooth HID. Connect to major devices such as tablets, smartphones, desktop computers, and video games. As a new type of input device, it uses a built-in infrared laser transmitter to project a standard keyboard onto the work surface, and can locate the click position and input information by means of optical recognition. No physical keyboard, small size and easy to carry, this projection keyboard can adapt to most working environments. FeaturesEnglish QWERTY keyboard layout. Truly portable design: perfect for on the goFull-size key pitch and shortcut keys for easy operationExcellent durability (no moving parts inside) Built-in lithium-ion polymer rechargeable battery, easy to moveCompatible with the latest operating systems: Windows XP and higher, Windows Phone 7 and higher, iOS4 and higher, Android 2.1 and higher, Mac OS X and higher. ***With display (compared with KB580)