Elide Fire’s ball looks like a toy and works like a fire extinguisher: throw the 1.4 kg TECHIDEAS model into a fire from a safe distance and it bursts within seconds, dousing up to 2.5 cubic meters in non-toxic powder. Mount it near a stove or breaker box instead, and it self-triggers on direct flame contact — no pin to pull, no one needing to be home. $160.