Cavius

Cavius is a Norwegian brand that makes wireless smoke alarms for homes. The company's main product line, the CAVIUS trådløs familie (wireless family), is built around what they call the world's smallest smoke alarm. These are physical detectors designed to mount on ceilings or walls, with a compact, modern look that blends into rooms better than the bulky plastic boxes most people are used to.

The alarms use CAVIUS CORE technology, which the company has been developing for over a decade. The key feature is wireless interconnect: when one alarm detects smoke, it triggers every other Cavius alarm in the house simultaneously. This means you get warned even if the fire starts in the basement while you are asleep on the top floor. The newer models come with an optional recessed mounting bracket that makes the alarm sit flush against the ceiling, giving it a cleaner appearance. The website emphasizes "Safer by Design" as a guiding principle.

Cavius is straightforward hardware for homeowners and families who want reliable fire detection without complex smart home setups. There are no apps, no AI, no voice assistants — just alarms that sense smoke and sound. If you need a basic, well-designed smoke alarm system that covers a whole house wirelessly and doesn't require an electrician to install, Cavius is worth a look.