JETech 2.4Ghz Wireless Mobile Optical Mouse with 3 CPI Levels and USB Wireless Receiver (0770) NOTE: The NANO USB receiver is inserted in the back of the mouse. Adopt the 2.4G frequency technology, working distance can reach to 8M-10M. 2.4G will give you a more comfortable, convenient and exact effect than the traditional FM radio wireless mouse. USB Nano Receiver which can be stored within the back of the mouse. Infrared technology ensures smooth track over a variety of surfaces. Tiny USB receiver occupies minimal space when attached to your computer. 4 Buttons (left, right, CPI and scroll wheel buttons). Compatible with Windows 98/2000/NT/ME/XP/Win7/Win8/Win10; No driver needed, plug and play. 3 adjustable CPI levels (800/1200/1600) Soft rubber grip and contoured body deliver continuous, all-day comfort. 12-month battery life on 1 AA battery (battery NOT included) practically eliminates the need to replace battery. Battery life may vary based on user and computing conditions. Package includes: 1x JETech 2.4Ghz Wireless Optical Mouse, instruction manual