About this item Efficient Solar Powered Rodent Repeller --- For optimal performance, we recommend placing a rodent deterrent 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 ground and drives the pest away from the area where the sound is transmitted. Safe to Use --- Humane and safe around pets and children Mole spikes keep moles away by emitting a sound pulse. They do not harm any animal in any way, as they contain no chemicals, poisons or dangerous ingredients. Effective and Wide Coverage --- Ultrasonic pest repellers emit low frequency pulses for 3-4 seconds every 20 seconds, which penetrate the ground and prevent moles from entering protected areas, as 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, the solar mole repeller repels mosquitoes and works continuously for up to 400 hours on a full charge, just plug in the solar mole repeller in a sunny spot in your garden, turn on the switch and it will protect your garden from infestations without having to change the batteries. Easy to Install---No wiring or external power required. Just plant the solar powered rodent repellents in the ground and press the button and they start working immediately. Excellent waterproof and rainproof design, so it works even in the rain.