Chaney Instruments Wireless Atomix Clock and Thermometer w/Sensor Base unit measures 9 by 7 by 1-1/2 inches; sensor measures 3-1/2 by 2-1/2 by 1 inches Wireless atomic clock and thermometer with remote sensor Displays month, date and day; simultaneously displays indoor and outdoor temperature in Fahrenheit or Celsius Radio receiver picks up official Atomic Clock broadcasts Clock powered by three AA batteries; sensor powered by two AAA batteries