Perman Portable Mini 2.4GHz 1600DPI Wireless 3 Buttons Optical Mouse Mice with USB Receiver for Computer PC Laptop Notebook Gray Size: Approx 100 x 60 x 35 mm (L x W x H). Power supply:1 x AA battery Required (NOT Included) High resolution: 1600DPI. Free controlling range: Within 10 meters (30 Feet) USB 2.0, also compatible with USB 1.1. Intelligent connectivity. no need to code, plug & play. High quality, compact design and light weight. Ideal for laptop & PC users for Home and Business. Rated working voltage: 1.5V. Rated working current: 15mA. Compatible with Windows XP, Vista, Windows 7, ME,2000 and Mac OS...or latest.