SCEIENTIFIC ERGONOMIC VERTICAL DESIGN: Vertical mice with 54º 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 less overall strain. HIGH SENSITIVE MOUSE CONTROL: Has 6 buttons and 3 levels DPI to change among 800/1200/1600 -Easily adjusts the sensitivity of the wireless mouse.Reliable 2.4GHz wireless connection with high anti-interference performance within 10 meters.The superior choice for internet surfers, players and worker. RECHARGEABLE ERGONOMIC WIRELESS MOUSE: Built-in rechargeable battery,no longer need to buy batteries.Intelligent power saving in auto sleep mode after 8 minutes idle and awake the vertival mice by pressing any key. Takes 2-3 hours to fully charge, which can be used for about a week.