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ADT sells home security systems and smart-home gadgets, plus the monitoring service that watches over them.
ADT is the company behind those little white keypads by the front door and the yard signs that warn burglars they picked the wrong house. It installs alarms, cameras, doorbell buzzers, and smart locks, mostly for homes and small businesses in the United States. The core promise is simple: if something trips a sensor, somebody responds.
The real business isn't the hardware — it's the subscription. Customers pay a monthly fee so ADT's monitoring centers can watch their sensors around the clock and call the police, fire department, or the customer when something goes off. That recurring revenue is the whole engine. It's predictable, it arrives every month, and it stacks up across millions of households. ADT also bundles in smart-home extras like video and automation, which raise the monthly bill and make customers stickier. ADT is a legacy name with a modern twist. It traces back to 1874 and went public again in 2018, and it has spent recent years pushing deeper into smart home and trying to grow without overspending on acquiring customers. A big part of its recent story is a partnership with Google, which invested in ADT and now supplies much of the smart-home technology and software behind its newer systems. ADT's other recurring headache is competition — from cheaper do-it-yourself setups like Ring (owned by Amazon) and SimpliSafe, which let people skip the professional monitoring fee, and from cable and telecom players that bundle security with internet service.
The honest pitch and the honest risk are the same thing. ADT sells peace of mind on a monthly plan, and people will pay for years if they trust it. But it's a mature, debt-carrying business in a market where lots of rivals want that same monthly check, so growth is slow and the fight is over keeping customers rather than finding them.
Saved answer · last researched 15 Nov 2026