Safe and Eco-Friendly: The ultrasonic pest repeller will not harm any animals, plants, or humans. There are no messy chemicals or pesticides, no traps, and no dead animals. The solar ultrasonic animal repellent gets rid of all animals by emitting a mixture of ultrasonic sound and powerful flashing LED strobe lights, scaring intruding animals and pests from leaving the area. Coverage Area - The motion sensor covers a 110-degree arc left and right, the motion sensor distance is up to 19.68 feet (8 m), working area up to 400 square feet. -- Once the animal stays near the front of the device, the PIR sensor starts working Upgraded Ultrasonic Version - Irregular and variable frequency makes it more effective in driving away the most aggressive animals with Passive Infrared (PIR) motion detection technology. Automatic adjustment of frequency range - 25KHZ-61KHZ, the (PIR) detects the movement and triggers the ultrasonic speaker emitting a tone that drives away outdoor animals like mice,