1. Left-Handed Ergonomic Vertical Mouse Designed for left-handers, it helps users form a healthy and natural "handshake" wrist and arm posture, making operations smoother and reducing overall fatigue. It is recommended for users with repetitive strain injury (RSI) and those who use computers for long periods. 2. Easy to Use, Plug and Play It uses a stable 2.4GHz wireless connection technology. There is a nano USB receiver at the bottom of the mouse. Users can plug it in and start using the mouse. This left-handed mouse measures 5.0×3.0×2.5 inches and weighs 95 grams. It may not be compatible with the Mac OS system. Users are advised to confirm the size and system compatibility before purchasing. 3. Multi-functional and Convenient Multiple functions can be achieved through 6 buttons. The "Back" and "Forward" function buttons provide convenience for web browsing. It has 3 levels of DPI (800/1200/1600), which can meet daily use and gaming needs. It is equipped with an optical engine, offering faster response, smoother tracking, and higher movement accuracy. 4. Energy - Saving Mouse There is an independent on/off switch button at the bottom of the mouse, which can help save energy. In addition, the mouse will automatically enter the sleep mode after being idle for 8 minutes, and can be awakened by pressing the left or right button. (Requires 2 AAA batteries, batteries are not included in the product.) 5. Wide Compatibility It is compatible with Windows 7, 8, 10, XP, 2000, CE, Vista, and Linux systems. It is suitable for laptops, desktops, portable computers, and other devices. (The USB receiver is located at the bottom of the mouse.)