The scientific ergonomic design encourages a healthy and neutral "handshake" wrist and arm position to achieve smoother movement and less overall stress.^The 800/1200/1600 DPI resolution optical tracking technology provides higher sensitivity than standard optical mice, allowing smooth and precise tracking on various surfaces.^Added next/previous buttons to facilitate web browsing; the best choice for Internet surfers, gamers and those who work in front of the computer for a long time.^After 8 minutes of inactivity, it will enter the power saving mode (the power supply is completely cut off), press the left and right keys to wake up.^The package includes: 1 wireless vertical ergonomic optical mouse (not including 2 AAA batteries), 1 2.4G USB receiver (at the bottom of the mouse), and 1 instruction manual.