Solar Power Motion Cat Repellent Ultrasonic Deterrent Dog Fox Cat Pest Animal. Package includes: Comes with 1 pack ultrasonic cat repellers, those repellers can help keep animals away by emitting ultrasonic waves, this motion sensor animal deterrent can let you worry-free about animal disturbance in Spring/summer Easy to Install: you can apply one solar animal repeller in your yard by mounting it into the ground with the spike provided, and hang another repeller on the wall where the sunlight can come in directly, so the solar panel can be powered effectively, so that provide your house with double protection against animals Dual Ultrasonic Design: With dual ultrasonic animal repeller design, this product can effectively drive away animals such as cats, birds and dogs or any other animalsultrasonic frequency 25-61khz, covers up to 30feet Working Principle: Our solar ultrasonic animal deterrent contains a motion detector system that detects movement and emits ultrasonic sound, alarm and light; When the motion detector detects a movement, it will trigger the ultrasonic speaker to emit a frequency noise that makes animals uncomfortable and keeps them away from the protected area. <span