HP Wireless Comfort Mobile Mouse (Ruby) Compact, ergonomically comfortable wireless mouse in Ruby--great for use at home and on the road High-precision laser sensor provides precise, smooth and responsive tracking Blue LED and contoured edges give this mouse a distinctive style; symmetric sculpted design for right or left handed comfort Connects to PCs via USB micro receiver (2.4 GHz) that's so small you can leave it plugged into your notebook 2 additional programmable buttons are easily accessible on each side which allow you to launch applications, control sound volume, and more