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The idea behind this type of whistle is that it won't disturb anyone standing right there with you. While these types of whistles can be heard by humans, a dog's hearing goes further into the ultrasonic range than a human's so they will be out of human hearing range.
The whistles are adjustable so that you can tune it to a frequency that gets the best response from your dog.
Specifications:
Produces ultra high frequencies in the range of 5800 Hz to 12,400 Hz
Package Includes:
1 x Dog Whistle
