Check the listing for details. MALLORY SONALERT SC628MD AUDIBLE BUZZER 6-28 VDC 60-75 DB ( MISSING PANEL NUT ). Condition: New – Open box. Listed at 30.00 USD. 12O5707 This Item Up For Offer is a MALLORY SONALERT P/N SC628MD AUDIBLE ALARM BUZZER ( NOTE: THESE ARE NEW AND UN-USED BUT MISSING THE BLACK PLASTIC PANEL NUT RIGHT SIDE IN PICTURE #4 ) 6-28 VOLTS DC 60 DB - 6 VDC 75 DB - 28 VDC (2) SCREWS + - TERMINALS WITH THREADED PANEL NUT (PIC. #4). Condition New and Unused, and Missing the Panel Nut on Right in Picture #4, From Government Surplus Old Stock. NSN Number 6350-01-083-7816. Measures 1-5/8" od. X 1-3/4" High. Made in the USA by MALLORY. 6350-01-083-7816 SPECIFICATIONS MRC CRITERIA CHARACTERISTIC NAME ITEM NAME BUZZER AGAV END ITEM IDENTIFICATION PROGRAM 616 A MODEM TASK AMWM ACTION TYPE VIBRATING AQFK LOUDNESS LEVEL IN DECIBELS 60 DB FOR 6 VOLTS AND 75 DB FOR 28 VOLTS I WELCOME YOUR INTEREST IN THIS ONE, AND ALL MY OTHER ITEMS.