Logitech R400 Wireless Presenter
Color: Black
Laser Class: Class 2 Laser
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

User experience
nice to use, solid in hand, the red light laser is really useful as pointer.

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