How it works: that do not physically harm these pests. After recognizing the animals, repellers emit powerful ultrasound and sound. They simply feel uncomfortable and drive them away. Cat Repellent Ultrasonic has a solid construction and a waterproof design. You don’t have to worry about it not working on rainy days. Animal distributor ultrasonic solar, ideal for outdoor areas such as gardens, shipyards, patios, driveways, patios, farms etc. Cat Repellent defense devices are particularly suitable for use on farms, rice fields, nurseries, orchards and insecticides, where they can be used to protect these areas co.ukom wild animals and do not disturb people. Solar & Waterproof: The Ultrasonic Repeller can be charged (3x AA NiMh batteries not included) by solar energy in the sun. Robust hard plastic construction that withstands rain, snow, ice and wind. Weatherproof, you can use it in any weather.