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 restart. Power saving design extends battery life. Takes 3-4 hours to fully charge, which can be used for about 7-8 weeks. DPI can be adjusted in three steps & long life button- Equipped with a high-performance optical engine, switch the cursor speed to 800, 1200, 1600 DPI according to the case, freely change the mouse speed, The optical tracking technology provides smoother and preciser tracking than a regular optical mice. Meets the request for regular work, study, design work etc.Button long life design can be about 5 million times. 2.4GHz wireless connection- With a USB receiver, safe and advanced 2.4GHz wireless transmission technology and optical tracking technology, no driver required, just connect to USB port of laptop or computer, effective transmission distance of 10 meters. Package included: 1 Pack