Sharp Atomic Clock - Jumbo 3" Easy to Read Numbers - Never Needs Setting! - Indoor/ Outdoor Temperature Display with Wireless Outdoor Sensor - SilverThe Sharp Atomic Wall Clock has a built in receiver that automatically synchronizes itself with the WWVB radio broadcast by the US Government s National Institute of Standards and Technology (NIST) in Fort Collins, Colorado. The Sharp Atomic Clock will always be accurate to within one second as it receives daily WWVB updates. The Wireless Sensor transmits the outdoor temperature to the Sharp Atomic Wall Clock. The sensor can be placed anywhere within