<p>Ultrasonic LED Pest Repeller Plug In. Easy to use - plug it in and let it work. Ultrasonic high frequency outputs will disrupt, irritate, and disorient pests. The sounds emitted are not in range to be heard by human. Each unit can cover 20-50 square meters.</p><br/><p>Input Voltage: 110 - 230V. Power Usage: &leq;3W.</p>