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An ultrasonic rat repeller creates an uncomfortable environment that a rat wants to get away from. The plug-in repeller emits an ultrasonic noise that rats and simplt don't like. It's not painful or cruel, just annoying and they want to leave.
Most of the ultrasonic repellers work in two different modes, but some have three.
It does this by using fluctuating ultrasonic waves to help keep your home free from pests. Once plugged into the plug socket, the units emits ultrasonic waves into the room and causes auditory stress to pests.
Once you plug the Pest Repeller into your mains socket it becomes part of the wiring loop throughout your home. It uses the wiring to broadcast an intermittent signal that again attacks the nervous system of the pest in your walls causing them to leave. This signal also can be felt by the Pest outwards from the wiring up to 6 feet. So this acts as a deterrent to pest coming into your home from the outside as they can feel these signals coming from your outside walls.
The ionic feature creates a stream of beneficial negative ions which helps destroy pollutants and bacteria in the air before you breath them in. These negative Ions are also effective at repelling ants, cockroaches, spiders and other insects.