SODIAL(R) Yard Solar Power Mouse Mice Mole Gopher Rodent Pest Repeller Chaser Completely powered by solar energy. The ultrasonic will deceive them and makes them feel endangered, so as to force them away from the vibrating area. Transmitting ultrasonic every 30 seconds, the effective coverage of the repeller is 650 square meters. Ideal pest control device to keep rodents away from your garden or lawns by utilizing both sonic wave sound and vibration technology. No poison, no chemical.