Alarm.com ADC-VDBA-PSU-DC Video Doorbell Wall Power Supply Kit for ADC-VDB770

The Alarm.com ADC-VDBA-PSU-DC is rated at 16 Volts DC, 1.25 Amps, or 20 Watts. It is used when the ADC-VDB770 cannot be set up with an existing doorbell chime circuit for power. It should only be used when there is no wired chime used in the circuit. The power supply can be used with or without a power module. If a power module is used, then you will need a 10 Watt / 10 Ohm resistor. If no power module is being used, then a flameproof 5 Watt / 3.9 Ohm resistor is needed.