Equity by La Crosse SkyScan 31420 Travel Atomic Alarm Clock Travel alarm clock with atomic clock; sets time and date based on WWVB radio transmissions from US Atomic Clock Digital display with on-demand yellow backlight; shows time, seconds, date, weekday, and indoor temperature With 5-minute snooze alarm; auto DST function with on/off option Requires separate purchase of 2 AAA alkaline batteries for power; folding design for compact travel Measures 3 inches wide by 3-1/2 inches deep by 4 inches high