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Title: It works
Review: This device emits a very high pitched sound when it senses something nearby. I can hear it if I hold it at ear level (in case you can't hear it, a red light turns on whenever it's triggered so you'll know when it's time to change the battery), but since it is such a high frequency it is very directional. When you stake it into the ground it's just about the height of the cats' ears. We first put it in front of the garage and the cats stayed away. Then we moved it to keep them away from the front door. So far so good. The cats are hanging around the garage again though so we need to buy another one.
