Ultrasonic and Works Effectively: Rodent repellents use the principle of ultrasonic and vibration technology. The device vibrates every 20 seconds and emits low-frequency sound pulses of 400-1000 Hz, disturbing and stimulating the nervous system of animals such as moles, keeping them unbearable and away from your garden or lawn. NOTE: It requires continuous uninterrupted use. If the moles become more active, which is a sign of irritation, they will disappear after a period of time. Solar Charging: We design this upgraded mouse back with solar charging and rechargeable batteries with the idea of environmental protection. In sunny days, it absorbs light energy and recharges the battery for daily needs. In the sun, 6-8 hours, can last up to 5-7 days. In the absence of sunlight, this mousetrap can be recharged. It only takes 3-4 hours for 5-7 days of use. NON-TOXIC AND HIGHEST QUALITY: This rodenticide does not produce any harmful or toxic chemicals, it will not cause any harm to crops,