Safe and environmentally friendly : The ultrasonic pest repeller does not harm any animal, plant or person. There are no dirty chemicals or pesticides, no traps, no dead animals. The Solar Ultrasonic Animal Repeller repels all animals by emitting a mix of ultrasonic sounds and powerful flashing LED strobe lights, scaring away intruding animals and pests from the area. Right, the motion sensor distance is up to 8 m (19.68 feet), the work area up to 400 square feet. -- Once the pet is near the front of the device, the PIR sensor starts working Improved ultrasonic version - Irregular and variable frequencies make it more effective in driving away the most aggressive animals Passive Infrared (PIR) motion detection technology. Automatically adjust frequency range - The speaker detects movement and triggers the ultrasonic sound that drives away animals such as mice, rats, skunks, dogs, cats, foxes, birds, Bats etc. Waterproof: IPX4, can be installed in your home, garden, yard or other