ULTRASONIC RAT REPELLING TECH: Ultrasonic animal repeller with simulation seismic wave can directly affect neurological auditory and immunity of animal by emitting a disorienting pulse, keeping animal away from the area, giving you a rats free and healthy environment. SAFE TO USE: No any chemical ingredient, physical ultrasonic wave which is only effect on various pests, such as mice, rats, snakes and more. No any harm to human, safe to kids, elder, pets. WIDE EFFECTIVE COVERAGE: The animal repellent can be effective within 40 ft. in diameter (in open area without any block). Note: ultrasonic cannot pass through walls or solid objects. SOLAR POWERED: Mole stake operated by a solar rechargeable battery, just insert the groundhog repellent stake in your garden and turn it on, then it will protect your garden from moles hills, no need replace battery EASY TO USE: Including 2 ultrasonic animal repellers, each is about 25cm, spike design is convenient to poke in ground or lawn. Suitable for lawn, flowerbed, vegetable field, etc.