Bornd E220 Wireless Mouse, Black: * US cypress RF chipset * Cellular techonology, multipoint interconnection * Special water transfer painting technology * Buttons: 3 (left, right, scroll) * Operation range: 30", 360 degrees * Resolution: 1000/2000DPI * Operating voltage: 3V * Operating current: 3.8mAh * Dimensions: 4.0" x 2.6" x 1.3" * Input current: 5V DC 30mAh * Interface: USB 2.0 * Compatibility: Windows 98/2000/XP/ME/Vista/7/8/Mac OS * Color: black * Weight of mouse and package: 0.597 lbs * 2x AA alkaline batteries (Included)