Effective 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 without danger around pets and children Anti-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 hazardous ingredients. Effective and Wide Coverage:---Pest Control Ultrasonic Repellents 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 this 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 non-stop for up to 400 hours on a full charge, just plug the solar mole repeller into a sunny spot in your garden, flip the switch and it will protect your garden from infestations without having to change batteries. > Easy to Install:--- No wiring or external power supply 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.