Black Box 4 x 1 DVI Switch with AudioThe Black Box 4 x 1 DVI Switch with Audio is engineered for seamless, professional grade routing of both video and audio signals from up to four sources to a single display. Designed with reliability and flexibility in mind, this switch makes it easy to switch between four input devicessuch as computers, Blu ray players, media players, or presentation PCswithout the hassle of swapping cables or power cords. Whether in a corporate boardroom, classroom,