Solar Powered Ultrasonic and Flashlight Animal Repeller Adjustable Monitoring Sensitivity and Distance with PIR Sensor Pest Repeller for Yard Garden Farm Park Solar pest repeller keeps moles, voles, gophers, mongoose or other rodents from invading your lawn yard garden and farm Repels over a 2000 square feet range by emitting an intermittent combination of sound and vibration and flashing light During the day, it runs on the sun. At night, it's powered by an internal rechargeable Ni-Cd solar charged battery for 24-hour-a-day protection The repeller has an aluminum duct which gives more durability and makes it easier to insert in the soil Able to adjust the sensitivity distance and frequency of the repeller.A frequency of 18,000 to 23,000 Hz,no poison, no chemical,safety way to repel animal