Worked for me

Set up an array of snap traps and spent a day waiting to no avail.

Caught the target in sight, rearranged the traps along the escape route.

Used this app to scare the target out of its hideout. Half an hour after: SNAP!

The app apparently worked and helped me effortlessly (after too much effort already) neutralize a little rat. Thank you.

Dee_vee about Ultrasonic Repeller, v1.1