Uses State-Of-The-Art Technology To Repel Moles Gophers Voles Shrews & Other Destructive Burrowing Rodents Solar-Powered & Maintenance-Free Environmentally Friendly - Eliminates Use Of Poisons 1 Charge Yields Up To 7 Days Of Power Capable Of Operating In All Weather Without Interruption Solar Panel Is Embedded In Watertight Housing Constructed Of Abs Material Produces Sonic Pulse Of Approximately 400 Hz Every 30 Sec & Covers Approximately 7500 Square Ft