AmoVee 2.4G Wireless Vertical Ergonomic Optical Mouse Ergonomic Design w/ 5 Buttons + Built-in Lithium-ion Rechargeable Battery + 1200 DPI Compatible w/ Windows 98SE / Me / 2000 / XP / 7 / 8 / NT / XP / Vista / Mac (Black) Scientific ergonomic design: Avoids "Mouse Hand" and encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain, much comfortable and flexible to operate. Wireless mouse, more convenient than wired mouse Next/previous buttons: Much convenient for you to browse webpage, surf online, play game and work at the computer for a long time with the added next/previous buttons. Rechargeable Battery: Requires no batteries, auto-sleep feature conserves power and extends battery life, it will wake if you press its right or left button. Operating distance: 33 feet (10m), USB connection, plug and play; Compatible with all versions of Windows OS, Mac OS X, Linux.