Feature: 100% brand new and high quality 2.4Ghz Wireless Optical Mouse Elegant, Ultra Slim,Comfortable Grip Switch Life: 5 million cycle 3 Buttons with scroll wheel Scroll easily in any direction Nano Mini Receiver hidden in the Mouse Bottom Built-in Energy Saving system. Wireless Technology works on most surfaces Wireless carrier frequency: 2402MHz-2480MHz 16 wireless working channels, automatic frequency jumping Mini Receiver can be contained and easy to carry Maximum acceleration: 14 inches per second Effective: 2.4GHz wireless transmission up to10 metres operating distance Intelligent connectivity, No Need to Code, Plug & Play Size:115 x 60 x 20mm Power: 2 x AAA Batteries(Not Included) Current: 1.5mA 1.5V Weight: about 65g How to use: Step1: Open the Battery Cover(Underneath the Mouse), Install 2pcs Alkaline AAA Batteries. Step2: Take out the USB Nano Dongle, and close the Battery Cover. Step3: Plug the USB Nano Dongle in the USB Port. Package Included: 1 x 2.4GHz USB Optical Wireless Mouse(Without original packaging) 1 x Mini Receiver