6-button mouse: infrared sensor and adjustable resolution (1000/1500/2000 dpi) Nano USB receiver: able to stay in the notebook permanently Long battery lifespan thanks to energy-efficiency infrared sensor (Using the supplied batteries, each with 2200mAh, allows a service life of 733 hours (at 6 mA) to be achieved. Assuming the mouse is used constantly for one hour a day and 230 work days a year, you will only need to change the battery after approx. 3 years) Optimised for both left-handed and right-handed operation Elegant touch due to the chrome plated scroll wheel with non-slip rubber coating Simple installation; no technical knowledge required Almost interference-free wireless 2.4 GHz technology (range of up to 10 metres)