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 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.