VicTsing Wireless Mouse, VicTsing 2.4G Wireless Mobile Optical Mouse with USB Nano Receiver, Energy-Saving Sleeping Mode 5 DPI Switch and Customized Function: no need any driver, plug and play. 5 DPI switch ( 800, 1200, 1600, 2000, 4800 ) to change the speed of mouse freely. Two side keys can be customized by software. 2.4G Wireless Transmission: 2.4GHz Wireless - A more secure and precise experience than the traditional FM radio system with an increased working distance of up to 15m. Long Battery Life and Auto Energy-saving Sleeping Mode: Up to 15 months of battery life virtually eliminates the need to change batteries. Battery life may vary based on user and computer conditions. The Auto Switch Off function will help you save energy as your Wireless Mouse will switch off when your PC is turned off or the receiver is disconnected. Feel-good design: Contoured shape and textured rubber grips keep your hand comfortable even after long hours, USB Nano Receiver which can be stored in the the back slot of the mouse. For Windows, Mac and Linux: Reliable wireless connection with Nano-receiver that can stay in your laptop.