I buzz without noise, alert without sound, warning of danger when I'm around. What am I that signals a plight, often unnoticed until there's a fright?

Category: Mystery · Difficulty: hard

Hint: Consider something that protects you from danger.

Answer

A smoke detector

Explanation

A smoke detector is vital for safety, often silent until it detects a threat and alerts those nearby.

This is a hard mystery riddle — a tricky one that takes a little thought. The answer is A smoke detector.

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