The ALPHA LED Serial Clock is the perfect solution for a wide range of applications where accurate, synchronized time is required. Now all your clocks can display the same precise, legal time, whether in the office, factory, warehouse, school or retail business. ALPHA Serial LED Clocks may be used as stand-alone time displays, or synchronized to a single master clock or PC. Each clock provides a variety of time zones and 12 or 24-hour display formats. With the battery backup capability, clock accuracy is unaffected by power failure, and maintains accurate time as soon as power is restored. Easily seen from across the room, these large, super-bright, 4-in. digits are visible up to a distance of 150 ft. In situations where ambient lighting conditions change, the ALPHA Serial Clock aslo features a dimming control.