Next, you will need to drill holes for the door buzzer and power supply. Make sure to measure and mark the locations of the holes before drilling to ensure proper alignment. Once the holes are drilled, you can begin mounting the door buzzer and power supply using the screws provided in your kit. After mounting the door buzzer and power supply, you will need to connect the wiring. S... https://www.365securitysolution.com/door-buzzer-system.html