The Cat Repeller CW consists of an infrared sensor and a motion detector. It can be inserted into the ground or mounted on the back and can be powered by an outlet or battery (30% stronger with power supply). As soon as the IR motion sensor detects movement and body heat within a 100-degree angle and a distance of up to approximately 12 meters, an ultrasonic alarm is triggered at four frequencies between 20 kHz and 24 kHz.

These ultrasonic sounds are inaudible to most other animals and humans. These frequencies are specifically tuned to the hearing of cats. They find this alarm sound unpleasant and will avoid the area immediately or after a short time. The Cat Repeller keeps cats away from an area of 125 m² in a pet-friendly manner. The Cat Repeller is recommended by the organization "Cat Protect" and the Royal Society for the Protection of Birds (RSPB). Studies show that even if a cat does not immediately respond to the alarm sound, it will eventually realize that it is the trigger for the alarm. Over time, the cat will avoid the protected area. The longer the CW is in use, the more effective its impact becomes.

The British organization for environmental, animal, bird, and nature conservation "RSPB" commissioned a two-year scientific study to deploy and test the Cat Repeller CW in 150 different locations. The study concluded the following: The CW has a deterrent effect on cats! The Cat Repeller CW significantly reduces the intrusion of cats into gardens! The CW continues to keep cats away from protected areas even after two years! Even after two years, the CW has a sustainable, effective, and deterrent effect. A pet-friendly, effective, safe, and reliable cat repeller. This device has now been successfully used over 2.5 million times!.