It is a new type of high-tech electronic pest repelling device, it uses sweep frequency high frequency ultrasonic circuit, scanning frequency ultrasound for 22~45KHZ.
Ultrasonic Pest Repeller 6 Packs Electronic Plug in
Impact Ultrasonic Rodent Repeller - Open Area Rodent Repeller
Electronic Ultrasonic Mouse Repeller PM-UMR4
Ultrasonic Mice And Rats,ultrasonic Mice Device,ultrasonic Mice
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Ultrasonic Pest Repeller, Indoor Ultrasonic Repellent
Mice Repellent Plug-in Ultrasonic Pest Repeller
Ultrasonic Mouse and Rat repellers
Ultrasonic Electric Pest Repeller, Mouse Repellent, Rodent
Ultrasonic Pest Mice mosquito Repeller Plug-in Non-Toxic Infant