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. | Pattern Projector keyboard layout Approx. 19mm Pitch | Light source: red laser | Keyboard(mouse) size: Approx. Width : 240mm, Height: 100mm | Keyboard(mouse) 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