Mice & Trackballs 1~5PCS USB 3.0 Receiver Wirele Mouse 2.4G Silent Mouse 4 Buttons 1600DPI Optical Computer Mouse Ergonomic Mice For Laptop PC Description: Model: 3100 Type: wirele mouse Mouse size: mouse (100-120mm) Connection with computer: wirele Applicable Model: Desktop Photoelectric resolution: 1200dpi(dpi) Number of keys: 4 (keys) Interface: USB Wirele transmiion frequency: 2.4GHz Does ergonomics support: support Adjustable resolution: 3rd gear and below Operating distance: 10(m) Working mode: photoelectric Roller direction: four-way roller Color: rubber black, iron gray, red, light blue Specifications: Support ergonomic design, stylish appearance and comfortable hand feeling. Optical positioning, positioning more accurate. Smart mini receiver, automatic connection, no tedious code alignment. Up to more than 1600 million kinds of ID coding designs enhance anti-interference characteristics of the mouse; Any 360 around the use angle, up to a control distance of about 10 meters; Intelligent circuit management design to save power for the mouse; Resolution 800-1600dpi FM, enjoy your wirele free space; System Requirements: Windows2000/XP/Vista/Linux/7/and Operating System Brand switch, the click effect is better, the use comfort is improved, no noise, and quieter. Package Included: 1 * Mouse 1 * Receiver Notes: Install 2 # 7 batteries for use