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. Effective: 2.4GHz wireless transmission up to10 metres operating distance Intelligent connectivity, No Need to Code, Plug & Play 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 Step4: Then the mouse will connect with the dongle automatically and start working. Specifications: Maximum acceleration: 14 inches per second Size:115 x 60 x 20mm Power: 2 x AAA Batteries(Not Included) Current: 1.5mA 1.5V Weight: about 65g Package Included: 1 x 2.4GHz USB Optical Wireless Mouse 1 x USB Receiver" Notes: The colors may be a little different for the different monitor display. Please allow minor deviation due to manual measurement