Characteristics:1.GHz wireless presenter pen, with a bright red light to see most of the backgrounds and the projective surface 2. With page up and down button, full screen, black screen, convenient to control your slide show. 3. With a USB receiver to the battery box, plug and play, powered by 1 x AAA battery (not included). 4 approximately 15 m / 59in effective wireless remote communication range, free to and interact with your audience. 5. Supports browsing types of Excel, PowerPoint, web page, Ebooks, etc. Descriptions: 1. Ergonomically ultra-thin design and size that gives you a comfortable of use. 2. Great assistant for teachers, students and other presenters, as as a gift considered Perfect. Specification: Material: ABS plastic Radio frequency: 2.4 GHz-2.483 GHz Power supply: 1 x AAA battery (not included) Effective Control Distance: . 15 m / 59in Output Power: Less than 5mW Current: 30 mA (max.) colour:black size:11x4CM Package Contents: 1 x transmitter 1 x USB receiver Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.