Wide Range of Effective Work: To achieve optimal performance, it is recommended to place the mole repellents every 70 ft on the lawn. The sonic pulses emitted 3-4s sonic pulses for every 30 seconds, penetrate the ground and also force the pests to evacuate the area through which the sound travels. Safe for Humans and Animals: The solar type ultrasonic mole repellent emits strong vibration waves and acoustic signals. It makes animals feel uncomfortable and can be rejected without harming them. Since it is an ultrasonic sensor, you can hear a small sound. It is harmless to humans and animals, but it is recommended to place it outdoors. Waterproof and durable: The mouse repellent is made of high-quality ABS and PVC materials, it is not easy to corrode when placed outdoors for a long time. This mole repellent has good waterproof performance and is not afraid of rain. So you don't have to worry about using it on rainy days. Solar charging: Powered by solar cell, no additional battery