A sonic grenade is a small stick grenade attached to any flat surface, such as the underside of a table. It was developed and used by the LEP to dispatch numerous enemies or hostiles. It is (in most cases) activated by audible command, and is known to blow out teeth and rupture eardrums, if not protected. Artemis Fowl II and Butler used this item to protect themselves by knocking a roomful of hostiles unconscious in The Eternity Code.

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