Specification : - Mouse size: 11.29cm (L) X 5.6cm (W) - Voltage: DC 5V 100mA - High precision with 1000dpi - MODEL: MS111 - USB Interface - Optical Three-button design - Condition: Original new Features: - The high-performance optical engine captures small movement inputs with ease. - Ease-of-use and better reliability are assured because there are no moving parts to wear out or collect dirt and dust - Reliable optical engine with a faster, more accurate response - Designed to maximize your comfort and productivity - Features three easy-to-use buttons including a scroll wheel.