From experience, Mallory and Digi-Key know that not all sound types, sound levels, and voltage ranges are popular enough to fully stock all part numbers. These alarms are made in the U.S., so if the alarm that is needed is not stocked, lead-time is minimal. The chart shown here has the part numbers for continuous and pulsing sound types.
 
                 
                 
                 
 
 
 
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