Use the Frequency Dial on the back of the unit to choose the pest you want to repel. Beside the dial there is a list of pests and their dial settings.
Here’s a few of the most commonly used settings:
Deer (audible): Setting 1;
Raccoons, flying foxes (audible): Setting 2;
Squirrels, cats, opossums, possums, chipmunks: Setting 3;
Bats, mice, rats: Setting 4