The Nite Guard Solar® provides a safe, solar-powered FLASH OF DANGER which implies to night animals that they have been "discovered". This is their deepest fear & forces them to flee the area. Overwhelming evidence from testing by our company and tens of thousands of users since 1997. Automatically turns on at dusk & off at full daylight. Solar Powered, Eco-Friendly, weatherproof. Guaranteed protection. See product videos here.