4 programmable buttons and clickable 4-way scroll wheel. Optimised for Windows 8 users, easy switching between apps via the blue strip touch tab. Ergonomically designed for right-handed use. Sculpted thumb grip for better comfort. BlueTrack technology gives pin-point accuracy along with multi-surface functionality. Rated range: 10 m. 2 x AA/LR6 batteries and software included. For Windows 8 (32/64-bit), 7 (32/64-bit), Vista (32-/64-bit), XP (SP3 32-bit) and Mac OS X10.2 or later.