3 Rivers Gate

I have tried the ultrasonic plug in device at home with mixed results. At the cabin I keep the crawlspace rodent free using a battery powered motion detector pest repeller device. It has a strobe light and can be set to alarm with random predator sounds to deter the critters. Works pretty good and the batteries can last up to 6 months.
Aspectek Yard Sentinel STROBE Ultrasonic Outdoor Pest Repeller