Features: Dual Ultrasonic Design: Double horn ultrasonic animal repeller design is more effective and combines a PIR detection system to scare the Dogs, Cats, Wild oars, Mouse, Birds and more other animals away from your zone, house, garden, or yard more. Easy To Set Up And Use: It can be used in the ground with the provided spike, or hang on the wallfences trees through the back slot (With direct sunshine recommended) Eco-friendly Economical: The solar powered ultrasonic animal repeller is Chemical Free Maintenance Free and water-resistant. No additional cost. Safety: This product can be used on low power, only repels animals and 25kHz-61kHz ultrasonic waves are emitted to repel them. No sound when working, no harm and interference to the human body. Motion SensorWhen the device is working and the PIR sensor deteets motion,the device will run for other 15 seconds in the next time, following this, the repeller will return to stand-by mode.