Ambient Weather RC-1200MTTH 12" Radio Controlled Wall Clock with Temperature & Humidity The Ambient Weather RC-1200MTTH with second hand turns an ordinary wall clock into an extraordinary, accurate time piece with the radio controlled time. The clock also includes a dial temperature and humidity sensor to monitor your environment. The clock automatically synchronizes the time several times a day based on a radio signal from Fort Collins, CO (WWVB). The Radio Controlled Clock never needs resetting and is accurate to the second. The clock automatically adjusts for daylight savings time and your time zone. An override daylight savings time feature is available for residents in Arizona.