TECKNET Pro 2.4G Ergonomic Wireless Mobile Optical Mouse with USB Nano Receiver for Laptop,PC,Computer,Chromebook,Notebook,6 Buttons,24 Months Battery Life,5 DPI Adjustment Levels Plug & Play - Comes with a tiny USB Nano receiver(stored within the back of the mouse) , just plug it into your PC and then forget it. 5 Adjustable DPI Level (2600/2000/1600/1200/800) - choose your own cursor speed Hassle-free Design - Up to 24-months battery life with a battery level indicator. Smart auto-sleep mode saves power (battery life may vary based on user and computing conditions) TeckNet Tru-Wave technology provides precise, smart cursor control over many surface types. TeckNet Co-Link technology  after pairing theres no need to re-establish pairing after a signal loss or shutdown 2.4GHz Wireless - ensures reliable connection with an increased working distance of up to 15m and eliminates delays, dropouts and interference. Contoured shape with soft rubber grips provide all-day comfort Compatible with Windows XP, Vista, 7, 8, 8.1,10 and Linux. Works with Notebook,Chromebook, PC, Laptop, Computer, and more.(batteries are NOT included)