HP Wireless Optical Comfort Mouse - Red Wine; Link-5 Micro Receiver - Link up to five compatible HP accessories to the same receiver; Get Convenience - The micro-receiver is so small you can leave it plugged in your desktop, notebook or store it inside the mouse; Stay Connected - Advanced 2.4 GHz wireless technology for less interference and longer range of operation to work anywhere; Travel with Confidence - Optical sensor with adjustable sensitivity (1000 CPI default, 1750 CPI max) works on many surfaces; Get Comfort - Symmetric sculpted design and rubber sides provide comfortable and secure grip for left or right hand use; Be Productive - 3 buttons including a smooth scroll wheel with middle rubber trim for great control scrolling up and down; green LED scroll wheel illumination indicator for adjustable sensitivity and low battery; Energy Efficient - Two AA batteries last up to 12 months