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The Company of Animals High Frequency Whistle is a lightweight, compact whistle, ideal for dog training, indoors or out. Ultrasonic whistles are particularly suited for training noise-sensitive breeds such as Border Collies. Adjustable pitch. Once adjusted please ensure the lock nut is fully tightened. Ergonomic design with key ring attachment. The COA Training Range has the essentials for the modern day dog owner, developed, tried and tested at the Animal Behaviour Centre of Dr Roger Mugford. Designed to suit dogs and puppies alike, COA is a comprehensive range of training aids for both the complete beginner or the experienced professional dog trainer. Our 30 years of experience in dog training really shines through in the COA Training Range.