A 'silent' fire alarm.
D000818:Animals; D000830:Animals, Laboratory; D001143:Arousal; D005390:Fires / Q000517:prevention & control*; D006168:Guinea Pigs; D006799:Housing, Animal; D051379:Mice; D011817:Rabbits; D051381:Rats; D013216:Reflex, Startle; D013016:Sound