Plug-and-play & function button- Plug-and-play No need to install a dedicated driver, just plug the USB receiver into your computer and enjoy this vertical mouse right away. Equipped with function buttons, convenient “forward / back” buttons for web browsing and spreadsheet software are standard equipment. Ergonomic and anti-fatigue design- Ergonomic, anti-fatigue vertical design is suitable for all hand types. vertical angle helps to reduce wrist muscles strain, keep your wrist in a natural state ,encourages healthy neutral “handshake” wrist and arm positions for smoother movement and reduce muscle tension, prevent repetitive stress and injury, and not feel tired after prolonged use. Built-in rechargeable battery & energy saving- Built-in rechargeable battery, no longer need to buy batteries. With breathing LED light, if you do not operate for 3 seconds, it will enter power saving mode, if you do not operate for 8 minutes, the mouse will enter smart sleep mode. Press any button to