EXCELLENT QUALITY -Safe and Economic Mole stake is operated by a solar battery. Insert the groundhog repellent stake in your garden. Protect your garden from moles hills. Mole deterrent devices solar renewable power that actually chase the pest away.SOLAR POWERED- The mole repellent is operated by a solar rechargeable battery. 4 hours of charge of solar mole repellent Ultrasonic in sunlight will be enough to keep them working for 4 days. Mole repellent stakes emit 3-4 seconds of low-frequency pulses every 20 seconds. *NOTE: Keep solar pest repeller stakes under the sun to charge for at least 2 days before installation.EASY TO INSTALL & EXCELLENT WATERPROOF PERFORMANCE--- This product is easy to install and requires no wiring. It has the characteristics of rainproof and waterproof, and can work continuously even in rainy days. But it can't be soaked in water for a long time.WIDE COVERAGE-Each mole repellent has an effective range of up to 7500 square feet. Recommend an installation of the yard mole repellents on every 70 feet throughout your lawn for optimal performance. Ample eight-pack of mole repellents for a great environment.