Radio controlled clocks are accurate to one second in one million years and automatically reset at the Daylight Saving Time changes. They use a AA battery movement with a miniaturized radio receiver that receives a signal from the NIST Atomic clock in Ft. Collins, CO. and adjusts several times a day.

Purchase with the Battery Booster Plus^® and provide maintenance-free operation for up to 5 years by eliminating the need to change batteries once a year.