Logitech Wireless Presenter R400 (Black)

Intuitive controls and red laser pointer make presentations a snap, even in the darkest auditoriums The 50-foot (15-meter) range and battery indicator help you make ordinary presentations extraordinary No software needed, just plug the receiver into a USB port and you're ready to go Intuitive slideshow controls ; Max Output: Less than 1mW ; Wave Length: 640～660nm (red light) ; Battery type: 2 AAA batteries ; Supported OS: Windows® Vista, Windows® 7, Windows® 8 ; Interface: USB Supported OS: Windows® Vista, Windows® 7, Windows® 8, Windows® 10 or later, Wave Length: 640～660nm (red light), Wireless technology: 2.4 GHz wireless technology 3 year limited hardware warranty