Mallory Sonalert SC628W Alarm Beeper 68 DB 6 – 28 VDC
Mallory Sonolert very lightly used if it was at all, it appears to have been just stored, use in alarm or really loud morse code buzzer.
Mallory Sonalert
Mallory Sonalert SC250HPR 5 ~ 16mA 4.5kHz 68dB @ 60V Panel Mount Piezo Buzzer
Image is Representational – See Manufacturer Specs | Buzzers Indicator, Internally Driven Piezo 5 ~ 16mA 4.5kHz 68dB @ 60V, 61cm Panel Mount Screw Terminal, Quick Connect Tab – 0.250″ (6.35mm)
Mallory Sonalert SNP2 1-5vdc 5-68dB 6-21mA Continuous Tone Snap in Panel NOS
Mallory Sonalert SNP2 1-5vdc 5-68dB 6-21mA Continuous Tone. Snap in Panel. Medium Continuous Tone. Frequency 2900 Hz. +-500Hz. NOS.
Mallory Sonalert SNP428F 4-28vdc 52-68dB 0.5-3mA Continuous Tone Snap in Panel
Mallory Sonalert SNP428F 4-28vdc 52-68dB 0.5-3mA Continuous Tone. Snap in Panel. Frequency 2900 Hz.