2.4GHz Free moving in 10 meters 16 automatically switchabel working frequency and over 60.000 groups of secure encoding to free external interfere Nano super Mini receiver. Plug-and-Play Built-in storage medium,no need re-code after you replace battery Resolution frequency800-1200CPIconversion Colorsilver material: plastic Built-in Mini receiver design Power On/OFF function Energy saving technology.2 pieces of AAA alkaline battery supply over 3 months working time. Low-Voltage alarming function Operation will be affected greatly due to using environment Battery life will be different,depending on personal habit of using mice : Power Supply: 2 x AAA Batteries (Not Included) Mouse type: Wireless Optical Mouse Interface: USB Button: 5 Buttons + 1 Scroll Wheel Resolution: 800 to 1200DPI Supports: Windows 2000/XP/Vista/ME Size: 3.94" x 2.36" x 1.38"(L x W x H) Weight: 4.09 oz Rated working Voltage:3.0V Rated working Current:15mA Package Includes: 1 x 2.4G Wireless Mouse 1 x Mini Receiver Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/-1-3cm.