The Supersonic Whistle is a whistle that can emit a shrill whistle at 300 decibels when blown into. Jerry shows it to the spies in Operation Pet Peeved, and Tony snatches it away from him. He nearly blows in it, but Jerry stops him to prevent his ears from being damaged before giving him earplugs that go with the whistle.
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Supersonic earplug case
Supersonic earplugs.