Logitech R400 Wireless Presenter Remote Control

Laser Class: 2 laser Max output: Less than 1m W Wave Length: 640~660nm (red light) Battery Battery type: 2 AAA batteries Battery life (Laser pointer): 20-hour maximum Battery life (Presenter): 1050-hour maximum Connectivity Wireless technology: 2.4 GHz wireless technology Operating distance: Approx 32.81 ft (10 m) ?