Features: English QWERTY keyboard layout.Truly portable design:perfect for on-the-go.Full size key pitch and shortcut keys for ease of operation.Superior durability (No moving component inside).Built-in Lithium-ion Polymer rechargeable battery for mobility and convenience Compatible with latest operating systems: for Windows XP & later, for Windows Phone 7 & later, for iOS4 and later, for Android 2.1 and later, for Mac OS X & later.Specifications:Pattern Projector keyboard layout Approx. 19mm Pitch Light source:red laser Keyboard size: Approx. Width : 240mm, Height: 100mm Keyboard Location: Approx. 80mm from the bottom of device Project Surface: Non-reflective, opaque flat surface Recognition Rate: Approx. up to 350 characters per minute Operating Surface: Any firm flat surface External Power Supply: USB Power / less than 5V 500mA Battery & Capacity: Lithium-ion Polymer Battery,700mAh(MA X) @ 3.7V Battery Operating Time: Approx. 150min Battery Charging Time: Approx. 90min Bluetooth(bm20730): V3.0, HID Profile Ver 1.0 Frequency Range: 2402-2480MHz Channel: 79 Modulation: GFSK Product Size (mm): 78mm x 40mm x 20mm Product Weight (g): 60g Colors: silver+black Package Included:1 x Laser projection keyboard 1 x USB Cable 1 x User Manual 1 x Quick Start Guide