Alarm.com VDB750 Mechanical Chime Dongle (ADC-VDBA-750-MCD)
 
The Alarm.com ADC-VDBA-750-MCD Mechanical Chime Dongle is a device used with the ADC-VDB750 Video Doorbell to resolve issues with mechanical chimes. It fixes problems like humming, buzzing, or rattling by regulating power, often when the transformer voltage is inadequate. The dongle installs directly inside the chime unit across the "Front/Rear" and "Trans" terminals. 
 
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