2006M: Plug-in Buzzer Add sound to your electric strike activation with a plug-in buzzer Need to know when people are entering? With the addition of a plug-in buzzer, you'll hear an audible sound every time the strike is energized. An easy way to add security to your access control system. Audible operation indicator. At 24VDC, 75db @11-3/4" Compatible Products Folger Adam - All Series HES Electric Strikes - All Series Close Downloads HES Plug-in Buzzer Overview HES Plug-in Buzzer Installation Instructions HES Accessories How to Order Close 4500C Series The low profile, heavy duty, fire-rated solution. 7501 Series The grade 1, fire-rated, pre-load solution.