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Presentation Features: It combines the functions of a green light, page up, page down, play slides, black screen for PowerPoint presentation. Through Tab and Enter button, the wireless presenter supports hyper link in the PowerPoint; Through Tab for switching window. A plug-and-play wireless receiver, there's no software to install. Transmitter Features: Technology: Radio Frequency Max Output: less than 5mW Class 3R Light Distance: more than 200m Battery: 1 x 360mAh Polymer Lithium Battery (included) Working Voltage: 3.7V Sleep Current