ACME 535 SILENT DOG WHISTLE
Acme 535 is the ultimate Dog training whistle. Features a sound only just heard by humans but what your dog hears is really loud and it travels up to 1.5km with minimal effort. Adjustable through a wide range of frequencies using a screw piston mechanism enabling you to tune it to suit your own dog, this is the most versatile whistle that can be used with all breeds. A booklet is supplied with each whistle giving easy instructions on adjusting the whistle and training your dog. Solid Brass design.