PerimeterEye vs ADTAn alarm that reports vs a property that responds.

ADT more or less invented the category it leads. Door and window sensors, motion detectors, a keypad by the door, professional installation, and a monitoring center staffed around the clock — sold on a monthly contract. It is a mature, competent monitoring service, and for over a century the model has been the default answer to "what do I do about break-ins?"

The model's core promise is that when something trips, trained people respond on your behalf. That promise is real as far as it goes. The question this page examines is where those people are while they respond — and where the intruder is.

Walk through what a monitored alarm actually does, without inventing any numbers. A sensor trips — which usually means a door or window has already been forced. The panel sounds and transmits a signal to a monitoring center, where the event lands in an operator's queue. The operator typically calls the premises or your listed contacts first, because dispatch protocols require ruling out a false alarm before police are requested.

If the operator cannot reach anyone, or reaches someone who confirms trouble, they can request police dispatch. Officers then triage that request against everything else happening in the jurisdiction. We won't quote a response-time figure — no honest national number exists — but notice what every step shares: it happens in a phone queue, a call center, and a patrol car. Nothing in the chain touches the property.

Meanwhile, on the property, the only thing confronting the intruder is a generic siren and the ticking of the process above. The event that matters is happening in one place, and the response is happening everywhere else.

PerimeterEye starts before the door, not after it. The 4K cameras and the on-site Brain — a true edge computer running PerimeterEye OS — verify a person on the property and classify them against the household. Family arrivals, mail carriers, and expected visitors never trigger deterrence. An unknown person at the fence line at 2 a.m. does.

Then the ladder climbs, in seconds and entirely on-site: a searchlight-class motorized spotlight locks onto the person and follows them — 355 degrees of rotation, 90 of tilt, the effect owners compare to a prison guard tower light. A live AI voice addresses the specific person in frame by description. If they persist, the 130 dB siren fires and you get a priority alert with live video.

You can watch, speak through two-way audio, or take manual control at any rung. The intruder experiences light, voice, and sound directed at them personally while they are still deciding whether to proceed — which is precisely the window a phone-queue chain can never reach.

The best available evidence on burglar decision-making is a 2013 UNC Charlotte survey of 422 incarcerated burglars (Kuhns et al., funded by the industry-backed research foundation AIREF — worth disclosing). Roughly 83% said they would try to determine whether an alarm was present before attempting a burglary, and about 60% would seek another target if one was. Over half said discovering an alarm mid-burglary would make them abort.

The same survey found the top target-selection factors were the proximity of other people, escape routes, and visible signs of security. Separately, a randomized street-lighting experiment across 77 New York City public-housing developments (Chalfin et al., NBER Working Paper 25798, 2019) cut nighttime outdoor index crimes by roughly 36%, with effects persisting for years. Light, visibility, and the sense of being noticed are what the evidence supports — and they are exactly what PerimeterEye projects. No security system can guarantee prevention of every incident, but the levers PerimeterEye pulls are the ones the research says matter.

ADT's model is service-first: installed equipment tied to a monthly monitoring agreement, with terms and pricing that vary by package and region. You are effectively renting an outcome — the monitoring center's attention — for as long as you pay.

PerimeterEye's model is ownership-first. You buy the system outright — sized to the property, every package including the Brain, the video intercom with AI Doorman, and the wall panel — paying monthly, as low as $145.17/mo for Essential (36 monthly payments at 10% APR, $0 down, through Affirm or Klarna, subject to approval), or in full at checkout, with no contract. The $99 per month software and AI subscription powers the analysis, briefings, and search. PerimeterEye is not an alarm-monitoring service — alerts and control go directly to you. Either system may help you qualify for an insurance discount — ask your carrier.

If what you specifically want is a staffed monitoring center calling on your behalf when a sensor trips — because you travel constantly, or you simply want a human institution in the loop — ADT delivers that, and has for generations. Some people find the contract structure a fair trade for never thinking about it.

If you primarily need interior intrusion detection in a small home with little exterior ground to cover, a sensor-based alarm covers the actual risk surface. PerimeterEye earns its keep on properties where the event begins outside — driveways, yards, long approaches — and where seconds of on-site response matter more than a phone tree.