Features: 2.4GHz wireless presenter pen, with a bright red light for easily seeing most backgrounds and projective surface. With button to page up & down, full screen, black screen, convenient for control your slideshow. With a USB receiver next to the battery case, plug and play, powered by 1 * AAA battery(not included). Approx. 15m / 59in effective wireless remote communicating range, free for you to walk around & interact with your audience. Support browsing kinds of Excel, PowerPoint, webpage, Ebooks etc. Ergonomically ultra-slim design & compact size offers you comfortable using feeling. Great assistant for teacher, lecturer, professor, scholar & other presenters, as well as a ideal considerate gift. Specifications: --Transmitter Material: Plastic Radio Frequency: 2.4GHz-2.483GHz Power Supply: 1 * AAA Battery(not included) Effective Control Distance: Approx. 15m / 59in Output Power: