- Accurate 24 hour digital time clock displays hours and minutes- User programmable 24 hour, 128 event time- Programmable day of week on/off feature selectable single, double, or triple alert sound- Three contact closure controlled sounds: Emergency (yelp) siren Temporal (slow whoop) evacuation signal (NFPA/ANSI compliant when used with supporting equipment)- Door bell (ding dong) sound- Volume controllable, 600 ohm, line level audio output- Non-volatile programming memory- Battery backup for maintain