ACME genuine "quiet" dog training whistle No. 535 Adjustable frequency. Good sound quality. weatherproof Designed and manufactured in the UK. Solid brass (polished brass)

• Adjustable frequency between 5400-12800 Hz. Protective end cap Designed with special air conductors to closely control the frequency produced and generate over a mile of noise with minimal effort.
• Quiet human audible sound to confirm the whistle is working. The whistle is designed to emit a relatively quiet whistle sound heard from humans. The only purpose of this is to ensure the user that a sound in the desired range is produced
• Includes information brochure which provides simple instructions (English language not guaranteed).
• Solid brass with various finishes.
• ACME Whistle is manufactured in the UK by specialists with over 150 years experience.

No "silent" dog whistle is really quiet. If it were nothing could hear anything! The word "silent" is quoted because you can hear it, BUT just weak. What your dog hears is really loud and hears up to 1.5 km. Adjustable through a wide range of frequencies using a screw piston mechanism that allows you to set it to fit your own dog. This is the most versatile silent dog whistle that can be used with all breeds. A booklet comes with each Acme 535 "Silent" dog whistle where you will get easy instructions on how to adjust the whistle and train your dog. It is designed with special air conductors to accurately control the frequency produced and generates over an English mile sound with minimal effort. Much of its original elegant shape from the Art Deco period has been preserved, as it is created by Clifford Hudson, son of founder Joseph. Solid brass lasts for decades. This is the ultimate "silent" dog whistle. Made of rust-resistant brass with nickel plating. You will have this silent whistle for years to come. It won't be noticed when you are more than a few meters away. The frequency of the whistle can be adjusted from 5800 Hz to 12,400 Hz. This is done by turning the bottom of the whistle. When the whistle is extended, the frequency will be higher. It may be difficult at first, but eventually you will find the perfect pitch for your dog. Higher pitch works better in long distances but is better for close work. If you are looking for a long-distance hunting whistle, you can try others in the range, like 560 Thunderer