Digital Wall Clock - Double-Sided - 20-Year Accuracy - Four 4-Inch Green Digits

The DuraTime HP440G-2SB is a double-sided ceiling or wall-mounted high precision plug-in digital wall clock with a 4-digit 4-inch high green LED display (12 or 24 hour format) and shatterproof polycarbonate lens. These come standard in a tough ABS plastic case but may be upgraded to a black aluminum case. For extra rough-and-tumble environments like high-traffic hallways or locker rooms, consider adding an optional Lexan clock guard.

Thanks to the oven-controlled crystal oscillator (OCXO), once configured, this clock won't need to be adjusted again for 20 years, except to add the occasional leap second using a firmware update from BRG (future leap seconds known at the time of purchase will be pre-programmed at the factory).

All DuraTime HP clocks are factory-synchronized with the U.S. atomic clock and pre-programmed to your local time zone and DST requirements based on the shipping address or the time zone information specified in the purchase options. The time zone and time format are user-changeable using buttons on the back of the clock.

Here are few more key points about all DuraTime HP digital clocks:

• BRG clocks are used worldwide by the U.S. government and military
• These clocks can be deep inside a building, underground, or behind thick walls: they do not use radio, GPS or CDMA signals to keep time
• Accurate to 1 second in 20 years (2 ppb)
• Battery backup maintains the correct time during power interruptions
• Available with 2.5" or 4" high red, blue, or green LED displays
• Four or six digit versions (HH:MM or HH:MM SS) can be configured to display 12- or 24-hour time format
• Available double-sided with ceiling or wall mounting brackets
• Can be configured to automatically change for Daylight Saving Time
• Can be configured to add leap seconds when necessary
• No batteries are required, but a plug is: all DuraTime HP clocks are plug-in
• No master clock or FCC license required

BRG's DuraTime HP clocks are powerful, precision instruments, designed to provide highly accurate time with no battery changes, no Daylight Saving Time adjustments, no master clocks, no radio signals, and no maintenance other than the rare leap second addition.