La Crosse Technology WS-8055U Digital Alarm Clock with Moon Phase Sets automatically by radio signal to atomic clock for time/date accuracy Reports indoor temperature in Fahrenheit or Celsius and moon phase 12- or 24-hour time mode; alarm with snooze Covers 13 different time zones from GMT to 12 GMT 4-1/2 by 1-3/4 by 3-3/4 inches; requires two AA batteries