Ultrasonic & Work Effectively : Mole repellents use ultrasonic principles and vibration technology. The unit vibrates and emits low-frequency sound pulses of 400 to 1000 Hz every 20 seconds, disturbing and stimulating the nervous system of animals such as moles, which make them unbearable and stay away from your garden or lawn. NOTE: It needs to be used continuously without interruption. If the moles become more active, it's a sign of irritation, they will disappear after a period of time. Solar and Charging: We adhere to the concept of environmental protection, using solar charging and rechargeable batteries to design this upgraded version of the mouse return. In sunny weather, it will absorb light energy and fill the battery to meet daily needs. In the sun, 6 to 8 hours, lasting up to 5 to 7 days. In the absence of sunshine, this mouse trap can be charged. It takes only 3 to 4 hours to use 5 to 7 days. Non-poison & Highest Quality: This rodent repellent will not produce any harmful or toxic chemicals, will not cause any harm to crops, plants and pets, and you do not have to worry about being harmful to children or adults. This rodent repellent is made of high-quality ABS material, so it brings a stable feeling when held and ensures maximum durability and service life. Waterproof & Extensive Coverage: This rodent repellent is made of high-quality waterproof and corrosion-resistant ABS flame-retardant materials to ensure that it can work normally in rainy days without worrying about water leakage and rain penetration. Mosquito repellent can spread in your house and garden with an effective area of up to 650 square meters. Use our 4-piece rodent repellent unit pack, so you can cover lawns, courtyards, gardens, farms and other small to large properties. Return Guarantee Policy: Your purchase will be fully protected when you place your order today. We 100% support customer after-sale service when unsatisfied. Any problems of the mole repellent please contact us, we are willing to give you a full refund or a replacement.