Logitech Wireless Presenter R500s

Bluetooth low energy technology and 2.4GHz wireless connection, Wireless range: 20m, Class: 1 laser, Max output: less than .039 mW, Wavelength: 640-660 nm (red light), Battery: 12 months + 1 extra week without laser pointer 1When your battery is low, the R500s goes into a power-saving mode – disabling the laser to extend battery life so you can continue presenting for an extra week. Battery life may vary based on use and computing conditions., Indicator Lights (LED): Battery and Connectivity LED