smart board wattage.Smart interactive whiteboard products are currently in a more competitive market, with SMART, a Canadian interactive whiteboard manufacturer, accounting for 65% of the market. For such products, we mainly consider the technology of touch screen, product size, projection method and so on. The projection methods mainly include front projection and rear projection, and consumers can choose their own use according to their own use. The three technologies of pressure sensing technology (resistive film technology), electromagnetic induction technology and infrared technology occupy the mainstream of the international and domestic markets. Infrared technology has accurate positioning and high precision, but it is easily interfered by strong infrared light, and has strong radiation, which weakens the demonstration effect of the product to a certain extent; electromagnetic induction technology is relatively prepared for positioning, and the display is relatively uniform, but can not be touched. For operation, a special pen must be used, and it is difficult to achieve a large-area layout.