Wireless Portable Interactive Whiteboard WB4700WB4700 is an input device, based on computer, and featured with people and computer interaction mode. It includes ultrasonic whiteboard and related software. Ultrasonic whiteboard can test position information written by electronic pen, and transfer this information to computer connected, this place information is integrated with screen picture in computer, it projects to whiteboard via projector, so, a full interactive demonstration is in your eyes .Users can effect a real face to face communication via this whiteboard, can write all kind