Dog Whistle Ultrasonic No Whistle 535

Acme Dog Whistle Ultrasonic No Whistle 535. The Acme 535 ultrasonic whistle can be heard by dogs from up to 1.5 km away.

• Your dog can hear it very clearly, while it is barely audible to humans.
• The whistle can be adjusted across a wide frequency range using a screw-piston mechanism, allowing you to train your dog with multiple frequencies.
• This is the most versatile whistle and can be used with all breeds.
• The whistle comes with easy-to-follow instructions in English on how to adjust the whistle and train your dog.
• Made of durable brass.