Effective Solar Powered Rodent Repellent - For optimal performance, we recommend placing a rodent repellent every 30 meters on your lawn when installing your garden. It emits a 3-4 second sound pulse every 40 seconds that penetrates the soil and drives the pest away from the area where the sound is transmitted. Safe Use --- Humane and harmless near pets and children The anti-mole studs keep moles away by emitting a sound pulse. They do not harm animals in any way as they do not contain any chemicals, poisons or dangerous ingredients. Effective and Wide Coverage - Ultrasonic pest repellents emit low-frequency pulses for 3-4 seconds each starting at 20 seconds, which are in the Penetrate soil and prevent moles from entering protected areas. Because moles are sensitive to noise and vibration and this is an effective way to prevent them from damaging outdoor areas such as lawns, yards and gardens . Solar Powered - Economical and Safe --- Solar Panel Built-in high quality polycrystalline