Viking's model CTG-1A is a clock controlled tone generator designed to provide accurately timed bong alert tones or buzzer alert tone sounds over an existing paging system. CTG-1A Features: Accurate 24 hour digital time clock displays hours and minutes synced to AC power. User programmable 24 hour, 128 event timer in two separate schedules Programmable day of week on/off feature Programmable single, double or triple alert tone output (selectable bong or buzzer) Three contact closure controlled sounds: Emergency siren (yelp) sound, Temporal (slow whoop) evacuation signal *NFPA/ANSI compliant when used with supporting equipment, Doorbell (chime) sound Volume controllable, 600 ohm line level audio output Non-volatile memory with four day clock backup Two sets of DPDT relay contacts for muting paging or background music during alert tones or timed relay events Switchable 50/60 Hz operation Switch for Daylight Saving Time Time Relay Mode