Logitech R800 Pro Presentation Remote with LCD Display for time tracking

Laser Class: Class 2 Laser Max Output: Less than 1mW Wave Length: 522～542 nm (green light) Battery type: 2 AAA batteries Battery life (Laser pointer): 20-hour maximum Battery life (Presenter): 1050-hour maximum Wireless operating distance: Approx 30m^1 Wireless technology: 2.4 GHz wireless technology Support OS: Windows Vista, Windows 7, Windows 8 Interface: USB