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. Built-in hidden USB receiver design, plug and play. Approx. 15m / 59in effective wireless remote communicating range, free for you to walk around & interact with your audience. Support kinds of Excel, PowerPoint, webpage, Ebooks browsing etc. Eco-friendly material, ergonomically fluent 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: 2 * AAA Battery(not included) Effective Control Distance: Approx. 15m / 59in Output Power: <5mW Current: 30mA(Max) Item Size: 11 * 4 * 2.5cm / 4.3 * 1.6 * 1in Item Weight: 37g / 1.3oz —Receiver Radio Frequency: 2.4GHz-2.483GHz Interface: USB 1.1/2.0 Package List: 1 * Transmitter 1 * USB Receiver(Built-in)