whiteboard eraser diy.Yushchenko Infrared Interactive Whiteboard is an advanced education or conference-assisted human-computer interaction device. It can be used with projectors, computers and other tools to achieve functions such as dust-free writing, free writing, and remote communication. From the structural shape, there are various forms such as front projection, rear projection, and writing board; from the hardware principle, the interactive whiteboard incorporates large-screen projection technology and precise positioning test technology. At this stage of the international or domestic market, there are a variety of technologies that can achieve accurate positioning of electronic whiteboards, representative of infrared, electromagnetic induction, resistance, ultrasound, CCD and other technologies. Each technology has different characteristics and advantages and has a certain share in the market. According to the analysis report of the international authoritative market research institute , in recent years, the electronic whiteboard using electromagnetic induction technology has gradually occupied the dominant position in the market in the international market. Antarc , Antarc, etc. occupy more than 1/2 of the market share, followed by infrared sensing and ultrasonic. Sensing technology, which accounts for about 1/6 of the market share.