Mice do not have bones, therefore, they can flatten and get through the smallest of cracks. I have ultrasonic emitters. No mice. Got these after some thirsty mouse chewed a hole in the dishwasher water supply. Still have the same ones I got in the late ninety's. Apparently still working. Think it is time to obtain some new ones though. Be aware, not all of them work. First ones I got from a company in Norwood, MA did nothing to deter the little creatures. These I got from California, San Francisco but I think they have now moved to a new location in California.
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I am a retired workaholic and continuing aquaholic
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