Newmen Wireless Presenter 2.4GHz Laser Pointer, Rechargeable PowerPoint Presentation Remote with Green Laser and LCD Display for Projection Screen and Flat Panel Display ULTRA BRIGHT GREEN LASER: The green laser is 3 times brighter than standard red lasers. Up to 50 feet (15meters) effective operating range. Excellent choice for company meeting rooms, classrooms, and various tradehows. CLOCK&TIMER SETTING FUNCTION: Do not need worry about your presentation timeout any more. CLOCK VIBRATION SETTING to remind you of time control. LCD screen to easily know time, low battery power, signal and mode status (PPT/KEYNOTE). OPERATION SYSTEM: The remote is compatible with all Windows system, Mac OS, Linux, and Android. Supports PowerPoint, Keynote. READY TO GO: Right out of the box. No software to install or setup required. Just plug in the receiver to a USB port and you're ready to present. POWER SAVING: Built in rechargeable Li-polymer battery to enable the laser pointer charged easily by a USB cable. And equipped with a separate switch and effectively avoids unwanted power consumption when you put it in your bag.