No whistle is completely silent.
What your dog hears is really loud and extends up to 1.5 km. The whistle has a wide range of frequencies using a mechanism that allows you to tune it to your own dog. This makes this whistle the most versatile whistle that can be used with all breeds. A booklet is provided with the whistle which contains a simple guide that provides easy guidance on adjusting the whistle and training your dog.
Solid brass that lasts for decades.
This is the ultimate dog training whistle

High pitch. Quiet for the user. Preferred by Spaniel owners, but an excellent all-round dog whistle for close and distance training. Single frequency. This flute is recommended for both city and country use

ACME - Dog whistle model 211.5 Alpha. Black/orange

ACME Alpha dog whistle with standard tone 211.5. Suitable for hunting and dog training.

With ALPHA you get the best sound quality ever with brighter, super high frequency and easier to control with Comfort Grip that adds stability in the hand in all weather conditions.

ALPHA allows you to work with the dog over even greater distances, with up to a 17% increase in the working area.

The frequencies generated by ALPHA are concentrated in the dog's mid-octave hearing range, enabling the dog to hear it more clearly.