Alarm Systems

DIY and pro-monitored alarm systems, judged on how they handle the ordinary stuff: pets, package deliveries, and a Wi-Fi outage at 2 a.m.

The question that decides most of this is not which brand. It is whether anyone answers when the siren goes off. A self-monitored kit pushes a notification to your phone and stops there. A monitored plan puts a person on the line who can send police while you are asleep or on a plane. The hardware is often the same in both cases; the monthly line is what changes, and so does what happens when nobody is looking at the phone.

Two failure modes come up more than any others in the reviews below. The first is the pet that trips a motion sensor every evening until somebody disarms the system for good, which is how an alarm turns into furniture. Sensor placement and pet-immune ranges deserve more attention than the app screenshots suggest. The second is the panel that goes deaf when the router does. A cellular backup radio is the difference between a system and a decoration, and plenty of entry-level kits ship without one.

We count sensors against the doors and windows in an ordinary flat or house rather than against a marketing floor plan. We read what the manual promises for a power cut against what owners report the backup battery actually holds, and we go looking for the complaint that says arming and disarming is slow enough that the household stopped bothering.

What you will not find here is a review that treats the contract as a footnote. Cancellation terms, who owns the equipment, and the price after the introductory year move the real cost more than the sticker does, so they get named in the review instead of buried in it.