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: less than 5mW Current: 30mA(Max) Item Size: 11 * 4 * 2.5cm / 4.3 * 1.6 * 1in Item Weight: 29g / 1oz --Receiver Radio Frequency: 2.4GHz-2.483GHz Interface: USB 1.1/2.0 Package List: 1 * Transmitter 1 * USB Receiver(Built-in)