These wall clocks cover a wide variety of requirements for accurate and easy to read displays. They are highly accurate with 100% solid state circuitry, so there are no moving parts to wear out. The clock is enclosed in a high impact ABS plastic housing. It is surface mounted on a single or double gang outlet box. For use in hallways, a double dial hanger bracket is available. The display should be visible under normal lighting conditions from distances up to 50 feet. The clock timing is line synchronous for long term accuracy. An internal time base continues to maintain the correct time during periods of power failure.