2.4GHz wireless connection, up to 10m operation distance (depending on environment). Automatically powers off when no 2.4GHz signal is detected to conserve battery. Ergonomic pen-shaped design for comfortable grip. Features low voltage alarm to提醒 battery replacement. Plug and play, no additional driver required. Material: ABS Operating Frequency: 2402MHz - 2480MHz Transmission Distance: >10M, 360 degrees Adjustable Resolution: 500 / 1000 CPI Tracking System: Optical Operating Current: 15mA Number of Buttons: 4 Rated Operating Voltage: 3V Rated Operating Current: 15mA Channels: 16 with Automatic Frequency Hopping Power Supply: 1 x 1.5V AAA Battery (Not Included) System Compatibility: Windows 98/XP/Vista/Windows 7, Tablet PC, Mac OS X, Linux Features: Wireless, Ergonomic Design, Pen Shape, Easy to Use Dimensions: 140mm x 20mm x 15mm / 5.51" x 0.79" x 0.59" (Approx.) Color Options: Red, Gray, Blue Package Includes: 1 x Pen Mouse, 1 x 2.4G Receiver