The Alarm.com ADC-VDBA-WP-U is a universal wall mounting plate for Alarm.com doorbells. It is compatible with Alarm.com ADC-VDB750, ADC-VDB770, ADC-VDB105, and ADC-VDB105X video doorbell cameras. It has a wide base that can cover undesirable blemishes from old installations. The Alarm.com ADC-VDBA-WP-U is used when replacing an older, larger doorbell and now you've uncovered some ugliness. It can cover up existing holes or missing paint from a previous installation. The ADC-VDBA-WP-U has pre-drilled holes that fit many different Alarm.com doorbells. Use the standard installation screws for your doorbell when using this universal wall plate. The ADC-VDBA-WP-U goes in between the video doorbell and the wall.