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 400Hz every 30 sec & covers approximately 7,500 sq ft;