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My dad and I went out to buy the Sunbeam SB105-3 (oh, quiver at its name!) today, which uses ultrasound to disturb rodents, spider, and ants. Three for about $20. It seems to be working... there was another one there, it was just one for $20; which also had an electromagnetic frequency for reaching through solid objects. We were concerned about its range and about any disruptions which may happen, so we didn't get that one.
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