Still testing. Too early to tell if it works. Will update later.
From sellers description :AUTOMATIC FREQUENCY SWITCHING: This ultrasonic pest repeller adopts multi-high-tech of electromagnetic wave, gixed/variable frequency ultrasonic and flashing light to repel pests. The device's smart technology randomly changes the ultrasonic frequency so that pests never get used to one frequency level. Smart, efficient and effective. SAFE AND NON-TOXIC : Stop spending money on Pest Control Companies that flood your house with hazardous chemicals. The Pest Solider Pest Control Ultrasonic Repellent is the safest and most effective solution that is guaranteed to provide no harm to you, your children, or your pets,Ultrasonic repellent's frequency (5kHz-20kHz) is in safe range (<100kHz) for kids, pregnant women and pets. It is harmless to the environment compared with the spray, capsules and other chemicals. LARGER COVERAGE AREA :COVERAGE AREA -Our electronic Plug In rodent control repellent products is effective for an area up to 1200 Square Feet. The normal ultrasonic wave can't cutthrough the wall, but the electromagnetic wave sent out by this electronic pest repeller can effectively cutthrough wall and the effect of repelling pests will not be lowered resulting from being impeded by some obstructions. EASY-TO-USE: This device can be up and running, protecting your home in a matter of seconds. Simply plug in the pest deterrent to any standard electrical socket and let it do the rest! Restore a state of peace and serenity to your home. With double night light design you can use it as a little night light, lower power consumption, suitable for long life operation. New Touch Switch design is easy to turn on or turn off the light. HIGH QUALITY DESIGN & SAFETY FEATURES: CE, FCC and RoHS approved with high quality materials and exacting manufacturing standards,child & pet friendly. 100% Satisfaction After-sale Service: If you have any question about our product, please feel free to email to us via Amazon message system, we will reply to you within 24H.