Valcom Digital Clock, 4-Inch, 4-Digits, Wired, 24VdcValcoms V D2440B Wired Digital Clock delivers clear, dependable timekeeping where every second counts. With a prominent 4 inch, four digit display, this timepiece is designed for environments that demand quick, at a glance readability and unwavering accuracy. From classrooms and hospital corridors to government facilities and production floors, the Valcom clock provides a professional, unobtrusive time reference that helps coordinate schedules,