That may damage the repeller.
SolarEK Solar Ultrasonic Animal Repeller Animal Chaser Pest Control Features: *Ungraded Ultrasonic Animal Repeller: Adopted advanced ultrasonic and PIR motion activated technology it can effectively repel animals and pests by emitting powerful ultrasonic wave and the irregular and variable frequency makes it more effective to drive away the most aggressive animals which may adapt and become immune to a certain frequency band. Or set it to repel all of them at the same time.