ACME Dog Training Whistle #535 | Premium Sound, Weather-proof, UK Made

The 535 whistle features a variable single frequency ranging from 5200 to 12800Hz, allowing users to select and set the exact frequency needed. This makes it suitable for all breeds of dogs, whether for close, medium, or long-distance work. While this sound may be very loud for dogs, it remains inaudible to human users, hence the "silent" designation. In order to confirm that the whistle is operating properly, it has been engineered to emit a relatively quiet whistle sound that is audible to humans.

The whistle also comes equipped with an adjustable frequency feature, as well as a protective end cap for added durability. This human-audible sound serves as a confirmation that the whistle is indeed functioning as intended. Without this feature, users might not realize if the whistle is not working due to incorrect frequency settings.

Overall, the design of the 535 whistle ensures that users can confidently rely on it for effective communication with their dogs, regardless of the distance or environment. With its adjustable frequency range and reassuring human-audible signal, this whistle is a reliable tool for dog training and communication.

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