2.4GHz wireless connection, up to 10m operation distance (depend on environment).If there is no 2.4GHz signal, it will automatically power off to save power.Ergonomic pen shape design, fits comfortably on your hand.With low voltage alarm function, reminds you to replace battery in time.Real plug and play, no extra driver needed.Item Name: Pen MouseMaterial: ABSOperating Frequency: 2402MHz - 2480MHzTransmission Distance: >10M, 360 DegreesResolutions Adjustable: 500/1000cpiTracing System: OpticalOperating Current: 15mAButton Numbers: 4 ButtonsRated Work Voltage: 3VRated Work Current: 15mAChannel: 16 with Automatic Frequency HoppingPower Supply: 1 x 1.5V AAA Battery (Not Included)System Requirements: for Windows98/XP/Vista/Windows7, for Tablet PC, for Mac OS X, for LinuxFeatures: Wireless, Ergonomic Design, Pen Shape, Easy to UseSize: 140mm x 20mm x 15mm/5.51" x 0.79" x 0.59" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Pen Mouse1 x 2.4G Receiver