Celluon EPIC Ultra-Portable Full-Size Virtual Keyboard Compatible with any devices with these operating systems: iOS4+, Android 4.0+, Mac OS X 10+, Windows XP+, Blackberry 10 devices. Bluetooth V3.0, HID Profile Ver 1.0 Built-in Lithium-ion Polymer Battery, Capacity: 660 mAH @ 3.7V Works on all flat, opaque surface. Adjustable brightness, sensitivity and sound feedback.