Ergonomic Vertical Design--Specifical for left-handers, the ergonomically-designed thumb rests and grips fit the contour of your palm for maximum comfort, perfect for small hands. Easy to Use--Plug and Play mouse with USB receiver, easy to start to use, no additional drivers or software needed. Six buttons give you improved control over your computer's systems. High-capacity Rechargeable Battery--Built-in rechargeable batter, no longer need to buy batteries. Intelligent Sleep and Wake Up--The sleeping function is for saving energy, it goes to sleep when you are not using it for 8 minutes, and you only need to click any button on the mouse once, it should be back to work. Wide Compatibility -- Compatible with Windows 7/8/10, XP, Vista and Linux etc.