Ergonomic Design:The contoured shape of this mouse is ergonomically designed to fit the natural curve of your hand,this compact mouse provides more portability and a better user experience. Colorful RGB LED Backlit: 7 different color changes randomly while in use, offering soothing lighting, creating cool and fancy atmosphere for work and play. Rechargeable battery: Built-in rechargeable lithium battery, Intelligent sleep mode can better extend battery life. It will enter auto sleep mode if you don't use it for 5 minutes to save battery. Plug and play:Easy to Use, plug & play design, no drivers need to be installed. 2.4GHz wireless transmission technology provides a powerful and reliable connection.And 3-level adjustable (800/1200/1600) allow you to freely control the mouse speed. Portable Compact mouse: The compact size and smooth cursor control make this mouse suitable for travelling carry and it can be easily put into your laptop bag. Wide compatibability: Well compatible with Windows7/8/10/XP, Vista, Mac OS X 10.4 etc. Fits for desktop, laptop, PC and other devices. Rii RM200 Wireless mouse