Door & Window Alarms

An alarm that only you hear is still worth having. These are standalone 120dB sensors — no app, no hub, no monthly fee, no WiFi to drop out.

Stick one on a door or window and it screams when the contact breaks. That noise does two things: it wakes you, and it tells whoever opened the door that they have been noticed. Most opportunistic entries end right there.

Battery powered, so they work in a power cut. Peel-and-stick, so they work in a rental.