Comanro 2.4g Laser Wired Vertical Ergonomic Mouse 6 Button 500/1000/2000/3500 DPI for PC-Small Size (Wireless) This Vertical Ergonomic Mouse is used scientific ergonomic design which encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. Common computer mouse would get muscle pain because lack of ergonomic design, If you get pain, discomfort and feel tried after using mouse, you may get RSI(repetitive strain injuries). Our vertical ergonomic mouse used OMRON micro switch, 500 / 1000 / 1800 / 2500 DPI Resolution Laser 2.4g Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces. 4 color breathing light design: the bottom of the mouse applies technical switch design. When you use the laser carve effect, you only need to turn the switch to the light button. Laser stable transmission, transmission speed. After the circuit design optimization and procedure strengthening, the stability of EV vertical mouse is improved greatly which will provide you more precise positioning. The side of EV vertical mouse applies 4 gear circulating adjustment and laser pickoff which reaching 2500DPI. All in all, the transmission speed is three times than the normal mouse. This Vertical Ergonomic Mouse every easy to use. You can directly this vertical mouse without installing any software, you can adjust the speed though the DPI button on the side of the ergonomic mouse. Added next/previous buttons provide convenience when webpage browsing; the best choice for internet surfers, gamers and people who work at length at the computer. Note: only for right hand, as our normal use habit, it might take sometime to change it.