I have no mouth, but I can tell you when to stop. What am I?
Category: Brain Teasers · Difficulty: hard
Hint: Consider something used to measure an interval of time.
Answer
A timer
Explanation
A timer counts down and signals when time is up without having a mouth.
This is a hard brain teasers riddle — a tricky one that takes a little thought. The answer is A timer.
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