HP 2.4GHz Wireless Laser Comfort Mouse - Black Stay Connected: Advanced 2.4 GHz wireless technology for less interference and longer range of operation to work anywhere Get Comfort: Symmetric sculpted design and rubber sides provide comfortable and secure grip for left or right hand use. Get Convenience: The micro-receiver is so small you can leave it plugged in your desktop, notebook or store it inside the mouse Travel with Confidence: Laser sensor with adjustable sensitivity (1200 CPI default, 1600 CPI max) works on most surfaces Be Productive: 5 programmable buttons including 4-way tilt smooth scroll wheel with middle rubber trim for great control scrolling up,down, left and right