Description Effective Solar Powered Rodent Repellent --- For optimal performance, we recommend placing a rodent repellent every 96 feet of your lawn when setting up your garden. It emits a 3-4 second sound pulse every 40 seconds, which penetrates the soil and drives the pest away from the area where the sound is transmitted. Safe to Use --- Cruelty free and safe around pets and children Mole tips repel moles 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 every 20 seconds, which penetrate the ground and prevent moles from entering protected areas, because moles are sensitive to noise and vibration and is an effective method of preventing them from damaging outdoor areas such as lawns, yards and gardens. Solar Powered - Economical and Safe --- Built-in high quality polycrystalline silicon solar panel