The compatible with 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 Wireless Sensor placed anywhere within 100 feet of the receiving unit to receive the outdoor temperature. NO wire installation needed! Automatically Sets for Daylight Savings Time: Just set the Daylight Savings Time too ON. The Atomic Clock with LCD display will always be accurate to within one second. If the atomic icon is flashing, the clock is looking for the Atomic signal. Wait until the atomic icon stops flashing before continuing with the clock set up. In most areas, a signal can be received at night. If the clock doesn’t receive the WWVB Atomic Signal immediately, wait overnight and it will be set in the morning. Classic Home Decor Style Material Plastic Color - Black Atomic Accuracy: Automatically synchronizes with the WWVB radio broadcast by the US Government√¢¬Ä¬ôs National Institute of Standards and Technology (NIST) for precise timekeeping Wireless Outdoor Sensor: Includes a wireless outdoor sensor that transmits outdoor temperature to the clock, with a range of up to 100 feet Jumbo 3√¢¬Ä¬ù Tall LCD Time Display: Easy to read and set up, can be used as a wall clock or desk clock with an integrated stand Displays Indoor and Outdoor Temperature: Provides real-time temperature readings along with calendar and day of the week Classic Home Decor Style: A stylish addition to any room in your home