... , Transmitting ultrasonic waves every 30 seconds, the solar mole/snake repeller is effective within an area ... of 650 square meters .the solar mole/ snake repeller radiates in all directions. ... . when the accumulator is fully charged, it can supply enough power for the dark hours, thus ... around-the-clock operation.Technical data:power supply: solar energy cell, or long-effective NI-Cad ...