2.4GHz wireless connection, up to 10m operation distance (depending on environment). If there is no 2.4GHz signal, it will automatically power off to save power. Ergonomic pen shape design, fits comfortably in your hand. With low voltage alarm function, reminds you to replace battery in time. Real plug and play, no extra driver needed. Material: ABS Operating Frequency: 2402MHz - 2480MHz Transmission Distance: >10M, 360 Degrees Resolutions Adjustable: 500 / 1000 CPI Tracing System: Optical Operating Current: 15mA Button Numbers: 4 Buttons Rated Work Voltage: 3V Rated Work Current: 15mA Channel: 16 with Automatic Frequency Hopping Power Supply: 1 x 1.5V AAA Battery (Not Included) System Requirements: Windows 98/XP/Vista/Windows 7, Tablet PC, Mac OS X, Linux Features: Wireless, Ergonomic Design, Pen Shape, Easy to Use Size: 140mm x 20mm x 15mm / 5.51" x 0.79" x 0.59" (Approx.) Color: Red, Gray, Blue (optional) Package Includes: 1 x Pen Mouse 1 x 2.4G Receiver