1. Four-user write at the same time +projector+ mobile stand, all in one set, service at one station; 2. Multi-touch, various gesture recognition functions, convenient and widely use; 3. High resolution, thin pen for fluent and natural writing, write at your willing for thinner letters, the thinnest pen for our whiteboard is 3mm. 4. Double use ways for only one board, work as interactive digital whiteboard by connection computer as well as works by normal dry eraser, well clearance without any trace.