The ProScreen 4650 is designed to meet the needs of most professional marketeers, meeting facilitators, trainers and senior executives while working in and around the same building, where lighting conditions are less controllable. As a complement to videoconferencing, hand held PC's. digital camera solutions or simply on its own, the ProScreen 4650 is the easy-to-use, reliable multimedia projector on which you can rely to deliver a very bright abd superb picture performance for up to 4,000 hours