... simulation function Portable ultrasonic interactive whiteboard--DM4600Easy to take, easy to install1)Work with any projectors 2)Work ... , graphics, functions, etc on the page , arbitrary zoom, move, rotate, lock, unlock, and change the color, etc7)Save format: support ... revoke or restore the previous action10)Index: view, edit, copy, paste, delete, and sort11)Printing: print text, include printing ...