Wireless Alarm Clock/Thermometer

Digital alarm clock with thermometer is accurate to 10-billionths of a second per day, picking up the radio signals continually broadcast by the cesium atomic clock at the National Institute of Standards and Technology in Colorado. Time (12/24-hr.) and day/date are automatically adjusted for savings time, leap year and even leap seconds! Shows indoor and outdoor temperatures in Celsius or Fahrenheit, and includes a wireless remote sensor transmitter (50' range). Includes alarm; snooze; blue backlight for night viewing. Two AA batteries not included; low-battery indicator. No unsightly external antenna. 4"x3- " tall.