Alarm.com VDB755P: The PoE Video Door Station That Disappears Into the Wall
Every commercial entry wants the same three things: see who is there, talk to them, and let the right people in, without bolting three boxes to the wall. Alarm.com’s PoE Video Door Station (ADC-VDB755P) does all three in one device on one network cable, and it now has a family of commercial mounting kits, including a flush-mount kit that sinks it into the wall and deco plates that make it read as part of the building. This is what the 755P is, who it suits, the specs that matter, how we install it on Utah offices and clinics, and when the wireless ADC-VDB770 doorbell is the better fit.
- Doorbell, camera and intercom in one PoE device. One Ethernet cable carries power and data; no doorbell transformer, no Wi-Fi at the entrance.
- Square 1440 x 1440 video with a 150-degree view both ways. You see the visitor’s face and the package at their feet in the same frame.
- Built for outside. IP66 and rated for -58 to 122 F, which covers a Park City January and a Lehi August.
- Five ways to mount it. Surface, single-gang, flush, angled plates and deco plates, so the same device fits a retrofit or an architect’s lobby.
- It unlocks the door. Paired with Alarm.com access control, the receptionist sees, talks and buzzes in from one screen. It can also act as a badge reader.
What the 755P is
The 755P is Alarm.com’s first PoE video doorbell: a 2MP door station with full-duplex two-way audio, infrared night vision to about 15 feet, people detection, and a call button that rings the Alarm.com app and any front-desk screen you choose. Video records like any other camera on your Alarm.com system, so every visitor and delivery is a clip on the timeline. It is built for offices, clinics, warehouses with a staffed entrance and multi-tenant doors, on the same platform as the alarm and access control.
Specs that matter
- Video: 1440 x 1440 (2MP), 150 degrees horizontal and vertical, HDR. The square frame is the practical part: head-to-toe on a person and the box on the step.
- Power and network: PoE 802.3af over a 10/100 RJ-45 port. One cable from the switch, no transformer, no chime wiring.
- Audio: full-duplex two-way talk, so both sides can speak at once like a phone call.
- Night: works down to 0 lux with IR, about 15 feet of IR range.
- Weather: IP66, operating temperature -58 to 122 F (-50 to 50 C), under 95 percent humidity non-condensing.
- Size: 2.45 x 4.50 x 1.54 inches, small enough for a mullion or a single-gang box.
- Access: with the ADC-VDBA-755P-OSDP accessory cable it connects to an Alarm.com access controller as an encrypted OSDP reader for cards, fobs and mobile credentials. Details in our post on the 755P as an access reader.
Five ways to mount it
Alarm.com’s commercial-grade mounting line, as of October 2026:
- Surface mount, no extra parts. The retrofit default, straight onto the wall.
- Single-gang mount (ADC-VDBA-755P-MNT) lands on a standard electrical box. Fast, clean, the usual pick when an old intercom left a box behind.
- Flush-mount kit (ADC-VDBA-755P-FMK) recesses the station into the wall. New construction and premium finishes.
- Angled wall plates (ADC-VDBA-755P-WMK) aim the camera at the approach on corner entries and odd walls.
- Deco plates (ADC-VDBA-755P-COVER-DG dark gray, -S silver) a trim frame for lobbies where the hardware should look architectural.
How we install it in Utah
A 755P job is a Cat6 pull to the entry, a PoE port on the switch, and the right mount for the wall. On a retrofit we usually find a dead two-wire intercom and a single-gang box, so the MNT plate goes on and the station is working the same afternoon. On new builds we specify the flush kit during pre-wire so the drywall and stone go in around it. We aim the lens with an angled plate when the approach comes from the side, which is most strip-retail doors along State Street. Then we tie the call button to the front-desk tablet and the manager’s phone, set recording rules, and if the door has an electric strike or maglock we connect it to the Alarm.com access controller so the receptionist can buzz people in from the live view. For a worked example, see the Cade Builder warehouse.
Two gotchas we see. First, PoE budget: a 755P on a long run from a cheap switch will brown out, so we check the switch’s per-port power. Second, snow glare: a north-facing entry with a white parking lot in January will overexpose any camera, and the angled plate pointing slightly down fixes most of it.
755P vs the ADC-VDB770 wireless doorbell
Both are Alarm.com doorbells and both record to the same timeline. The VDB770 is the residential pick: it runs on the existing 16-30 VAC doorbell transformer, connects over 2.4 or 5 GHz Wi-Fi, has a tall 1440 x 1920 frame with a 115 by 150 degree view, HDR, two-way audio and touchless calling. If a home already has doorbell wire and good Wi-Fi at the door, it is cheaper and simpler.
The 755P is the commercial pick: PoE means no transformer and no Wi-Fi at an entrance that may be far from the access point, it is IP66 and rated far colder, the mounting kits survive public traffic, and it can become an access reader. We use the 770 on houses and the 755P on anything with a receptionist, a tenant list or a loading dock. For a home that wants a wired doorbell on a UniFi system, our cameras page covers the UniFi G6 Pro Entry alternative.
Frequently asked
Who answers when the button is pressed? Anyone you choose: the Alarm.com app on staff phones, and a front-desk device. Several people can be rung at once.
Can it unlock the door? Yes, when the door is on an Alarm.com access controller. The person answering sees live video and unlocks from the same screen.
Does it need a video plan? Recorded clips and analytics need a video service plan on the account, the same as any Alarm.com camera.
Will it survive a Utah winter? The rating is -58 F, and we have units on exposed Wasatch Back entries with no trouble. Keep it out of direct sprinkler spray.
Can I retrofit it onto an old intercom location? Usually. We reuse the box with the single-gang mount and pull one Cat6 to replace the old two-wire.
Can it work at a home? Yes, if the home has Ethernet at the door or we can get a cable there. Most homes are better served by the 770.
Planning a commercial entry? We design and install Alarm.com video, access control and intrusion for offices, clinics and warehouses across Utah County, Salt Lake County and Park City. Walk your entry with us and we will tell you which mount, which switch and whether the door should be a reader as well. Call (928) THE-PROS or Kyle direct at (801) 458-7747.
Shield Low Voltage is a licensed Utah alarm company and Alarm.com dealer. Product details are from Alarm.com’s documentation as of October 2026: ADC-VDB755P Commercial-Grade Mounting Solutions (MKT-6728) and the ADC-VDB755P data sheet.
