Miš SPEEDLINK KAPPA Wireless black, SL-630011-BK

Sensing method: New-generation of Advanced optical tracking
Resolution dpi: 1000
Total number of buttons: 3
Scroll Wheel: Yes
Tilt function: No
Unifying-ready: Yes
Battery: 1-AA
Battery life: 18 months*

*Battery life may vary based on user and computing conditions.
Operation distance: 25m (around 80 ft) maximum*

*Distance may vary based on environment.
Wireless system: Advanced 2.4GHz wireless technology
Connection I / F: USB