1, office teaching special/whiteboard pen + page-turning pen in one, teaching more convenient and easy. 2, innovative/compact enough, fewer buttons/full-function technology/a variety of functions of one-button operation. 3, radio frequency/omni-directional demonstration, good transmission without lag, 360° light free demonstration. 4, integrated MINI receiver, built-in receiver, convenient storage and portable, plug and play, 5, refer to the remote control volume adjustment, one key to increase the volume, one key to reduce, easy to use, fully in line with People's Daily habits. low power consumption:1 x AAA battery, enough for more than half a year, at any time to replace the battery(No batteries included). do not hurt the screen hair contact, contact soft and hard moderate, do not hurt the screen, LCD screen can also be used. Control distance: 15M Remote control technology: RF2.4GHz distance: 200m (demonstration environment) Operating voltage: 1.5V Standby current: 30uA Receiver: : For /for Compatible interface: USB2.0 is compatible with USB1.1 and USB3.0 Operating voltage: USB bus power supply (4.5-5.5V) Different factory batches, if there are slight differences in appearance, it not affect the use Colour:Black Material:copper Package Contents: 1 x demo pen 1 x bag 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.