Highlight Scientific ergonomic design encourages healthy neutral "handshake" wrist Rechargeable Function: Only charge 3 hours and use more than 30 days. Cool and classic appearance makes it more attractive Interface: Wireless 2.4G System support: Windows XP,Windows 7,Windows 8,Windows Vista,Mac OS,Windows 98,Windows ME,Windows 2000 Optical Resolution 800 / 1000 /1200 DPI Lifelong clicks 1 million 1 Month Local Warranty for manufacturing defects only Dimension: 10.4 x 7.6 x 6 cm What is in the box: 1 x Ergonomic Vertical mouse, 1 x Charging Cable Description Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. 800 / 1000 / 1200 DPI Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces. Added next/previous buttons provide convenience when webpage browsing, the superior choice for internet surfers, gamers and people who work at length at the computer.