Logitech M171 Wireless Mouse, 2.4 GHz with USB Mini Receiver,...

Sensor Technology Smooth optical tracking DPI (Min/Max): 1000± Buttons Number of Buttons: 3 (Left/Right-click, Middle click) Scrolling Line-by-line scrolling Scroll Wheel: Yes, 2D, optical Battery Battery: 12 months Battery Details: 1 x AA (included) Connectivity Connection Type: 2.4 GHz wireless connection Wireless range: 10 m Connect / Power: Yes, on/off switch