Wireless Presenter Logitech R400

Height x Width x Depth:
1.49 in (37.8 mm) x 4.55 in (115.5 mm) x 1.08 in (27.4 mm)
Weight: 2.01 oz (57 g)
Color: Black
Max Output: Less than 1mW
Wave Length: 640～660nm (red light)
Battery type: 2 AAA batteries
Battery life (Laser pointer): 20-hour maximum
Battery life (Presenter): 1050-hour maximum
Wireless operating distance: Approx 10m 2
Wireless technology: 2.4 GHz wireless technology
Supported OS: Windows Vista, Windows 7, Windows 8
Interface: USB