Logitech Presenter Wireless R500s

Presentation remote

Height: 123.6 mm Width: 36.6 mm Depth: 24.7 mm Weight: 48.4 g, included Battery (not including Receiver) 

Receiver

Height: 25.0 mm Width: 17.5 mm Depth: 6.6 mm Weight: 2 g 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  Connection Type: Bluetooth low energy technology and 2.4GHz wireless connection  Wireless range: 20 m 2It may vary based on use and computing conditions.