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These devices are usually combined with a motion sensor which is triggered by movement within the sensors range. This causes the device to emit high frequency noise which is uncomfortable to the cats, and inaudible to most humans (although they can still experience unpleasant subjective effects and, potentially, shifts in the hearing threshold ...
The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...
A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.
A noisemaker is something intended to make a loud noise, usually for fun. Instruments or devices commonly considered "noisemakers" include: pea whistles; air horns, composed of a pressurized air source coupled to a horn, designed to create an extremely loud noise; fireworks, such as firecrackers, bottle rockets, bang snaps and others
The strategic deployment of noise by fans, intended to distract opposing teams, became an integral part of sports culture, especially in college football where marching bands played a significant role. The widespread availability of electronic devices capable of generating significant noise levels led sports leagues to regulate artificial noise.
#1 Get Ready To Level Up Your Prank Game! Fun Times Start With These Funny, Realistic Voice & Motion Activated Prank Stickers - Fool-Proof Fun For Any Situation. Review: "I love these stickers. I ...