Easy to use Just plug and play, no need driver and software. Comfortable feeling Ergonomic design provide comfortable feeling and let your hands out of fatigue when you use the mouse. CPI adjustable function With 3 adjustable CPI 800/1200/1600, factory setting is 1200CPI. Press the left and right button at the same time to switch the CPI. Nano receiver A very small size design for Nano receiver, it can be plug and play and stay on USB port of PC/Notebook without interference. Saving power mode If mouse is stay out of work for 8 minutes, it will be converted to power saving mode automatically, press any button to restart it.