1.2.4GHz wireless presenter pen, with a bright red light for easily seeing most backgrounds and projective . 2.With button to page up & down, full screen, black screen, convenient for control your slideshow. 3.With a USB receiver next to the battery case, plug and play, powered by 1 * AAA battery(not included). 4.. 15m / 59in effective wireless remote communicating range, free to walk around & interact with your audience. 5.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 perfect considerate gift. Radio Frequency: 2.4GHz-2.483GHz Power Supply: 1 * AAA Battery(not included) Effective Control Distance: . 15m / 59in Output Power: Less than 5mW Current: 30mA(Max) Colour:black+grey Material:ABS Size:105 x 40 x 30mm Package Contents: 2 x Transmitter 2 x USB Receiver Only the above package content,