Recommend sizes are 55” to 100”, same function as computer+cellar phone+TV. It combines with teaching & conference function and dual system. Under android OS, you can install any app you want just like your cellar phone. Powerful “whiteboard” software contains all tools teacher will need in math/ chemical/ science/language classes that is built-in freely. Interactive discussion can be achieved through “multi-screen sharing” APP inside. Recommend the scenario on commercial display, classroom, and office meeting.

The input can be finger or pen and 10-20 touch pionts at the same time. 4 points calibration only, USB powered plug and play. A powerful educational software bundle with shipment. It gives learning become interesting at school. Available sizes from 68” to 100”. 

Changing your writings on paper become digital format in cellar phone/tablet 0.01mm high resolution in writing. It keeps what it shows in cellar phone/tablet. The effect is exactly same as your original writings/drawings.