Mobile Optical Retractable Mouse Model: MP2100BLU . It Features: Optical Sensing Technology, Soft Rubberized Edges, Retractable Design with Built-in Scroll Wheel. Package Contents: Wireless Optical Mobile Mouse and Receiver and Warranty Information. System Requirements: PC & Mac Compatible, Windows 2000, XP and Vista , Mac OS 10.3 and above An Available USB Port and 2 AA Alkaline Batteries