Extracted from the KOKUYO website: ● Allows you to advance/go back PowerPoint slides and start/end slideshows with buttons on the presenter. Employs RF (radio frequency) communication for omnidirectional transmission. *The slideshow start function is not available on Mac OS. ● Simply plug the receiver into a USB port for use; no driver installation is required, so you can start using it immediately. *ID settings are required. ● Complies with the Consumer Product Safety Act. The laser button only illuminates while pressed, providing peace of mind. Dimensions (W・D・H): 38・103・17 mm Receiver Dimensions (W・D・H): 22・70・10 mm Materials: Main body/Receiver: ABS Weight: Main body: Approximately 48g (including batteries), Receiver: Approximately 10g Beam Reach: Approximately 50m (when used at night) Beam Diameter: Approximately 5mm (at a distance of 3m)