The Microsoft Arc Wireless Keyboard for PC and Xbox 360 is a compact keyboard designed for use by individuals with upper extremity disabilities. Useful for individuals with limited range of motion, this lightweight, small-sized keyboard has an ergonomic curved design, a stowable Nano Transceiver for wireless connectivity, and four programmable buttons. A storage and carrying case is also included. COMPATIBILITY: For use on persomal computers and X-Box 360 gaming systems. SYSTEM REQUIREMENTS: Microsoft Windows Vista / XP / 7 and USB port. POWER: Uses 2 double-A batteries. DIMENSIONS: 12.6 x 8.8 x 0.9 inches. WEIGHT: 6.4 ounces. COLOR: Black or white. WARRANTY: 3 years.