Designed with 5.5V 70mAh polycrystalline solar panel, high energy conversion rate and environmental friendly. Works by continuously transmitting a powerful range of ultrasonic sound waves that drives away pesty animals, protects an area up to 220 square meters. Sound wave frequencies are non-toxic & harmless to humans, an alternative to toxic chemicals and dangerous traps. Designed with PIR sensor, detects an area of approx.110 degree(horizon & vertical). Rechargeable (built-in )4.8V/800mAh Ni-Cd battery, work for about 5 days after getting full charge(in general takes 12 hours). Protection grade is up to IP44, can be plug into grass with detachable stick or directly placed on the tree, trunk, stake or other outdoor places.