There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
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Recent changes to this guideFebruary 2025: The Dreame X60 Max Ultra Complete takes over as the best robot vacuum for pet hair on carpet, replacing the Dreame Aqua10 Ultra Roller. The Roborock Qrevo Curv 2 Flow takes over as the best robot vacuum for pet hair on hardwood, replacing the Roborock Saros 10R.
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