The noise emitted from the devices will scare deer and they hate the sound. It can make them run away and possibly remember not to go near the place with the bad noise again.

A frightened deer smashed through a window at a local business park and was trapped inside an office, so employees called ...

If a deer is hungry, bad taste or strong odor won’t keep it away from your plants. Scare tactics, such as dogs, only provide temporary relief. As soon as the dog is gone, the deer return. Ultrasonic ...

The researchers looked at data from Wisconsin and said that wolves reduce deer populations and also scare deer away from linear landscape features.