Logitech M185

Connection Type: 2.4GHz wireless connection
USB Protocol: 2
Connect / Power: Yes, on/off switch
Battery Details: 1 x AA
Battery Life (not rechargeable): 12 months
DPI (Min/Max): 1000±
Sensor technology: Logitech Advanced Optical Tracking
Scroll Wheel: Yes, 2D
Standard and Special Buttons: Middle-click