Honeywell TE211W Atomic Clock with Wireless Thermometer Elegant clock and weather monitor for home or office use Atomic clock automatically updates to within one second of official government time and adjusts for Daylight Savings Time Remote sensor features 100-foot range and is accurate between minus 38 to 158 degrees Fahrenheit Display indoor and outdoor temperatures, and indoor temperature trend readings, in Fahrenheit or Celsius Can monitor two additional locations with optional sensors