1. Page turning pen: The 300-meter ultra-long control distance is more suitable for presentations in large conference halls. It can move freely in the room and control the ppt at any time. 2. The green , which is 10 times brighter than the red , is suitable for all demonstration screens. It can be displayed clearly even in a bright room and give more effective speeches in a bright and comfortable atmosphere. 3. With LCD screen to display the time, with timer and silent vibration reminder, to help you master the time, no need to stare at the clock all the time. The 1000 mAh lithium battery supports long-term operation. 4. The mini USB receiver supports plug-and-play technology, no need to drive, plug in the computer to start the demonstration, no need to wait. 5. Support page up, page down, full screen, black screen, hyperlink, support most presentation software, compatible with Windows 2003, XP, Windows Vista, Windows 7, Windows 8, Windows 10, Mac OS, Linux, Android, etc. operating system. safety warning: 1. Warning 433MHz transmitter is not a toy; under no circumstances should it be pointed at human eyes or airplanes. 2. The flip pen is only for adults. 3. It is illegal to aim the beam at any flying objects, moving vehicles and any public or private buildings. 4. The should not be directed at people or animals. 5. If used improperly, the page turning pen may be very dangerous. Colour:Black Material:Plastic Package Contents: 4 x Wireless Powerpoint 4 x Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.