Sometimes the cap can be difficult to remove. You may want to warm the plastic cap with a hair dryer or some other heat source to make it easier. I have had good luck getting the cap off by sticking a pen or pencil halfway through the ring on the end and using it as a handle to pull with. Once it comes apart the first time it usually isn't a problem anymore.
This whistle is a "silent whistle". It is used to give commands to dogs over distance just as any other whistle is used. It is called a "silent whistle" because it operates on a frequency above that of the average person's hearing. Most people will hear a faint sound. In other words it is very LOUD to dogs but very QUIET to people.
It is not a "silencer" and does nothing to make a dog stop barking nor will it repel an aggressive dog.
I have not introduced this into my training yet. The dog is whistle broke, so I am sure this will be a useful tool.
Product Rating: 5 out of 5-stars. Review ID: 27037 Reviewed: 2016-02-05
"Perfect for the urban park trainer."
By: Jamie Murphy
Perfect for the urban park trainer. Silent enough to run the dog at 5am in the park across the street and not wake a soul. Another plus, all of your friends are using a Roy in the field, so your dog is on his own frequency. Tip-adjust pitch, then use thread lock, then tighten, other wise the frequency can change. This is not in the instructions, but a vital step.
Product Rating: 4 out of 5-stars. Review ID: 88 Reviewed: 2009-09-08
Customer Review #25634
By: Mike Namken From TX
Hunts. Good whistle. I like that you can adjust the pitchsound.
Product Rating: 4 out of 5-stars. Review ID: 25634 Reviewed: 2015-12-18
Customer Review #1072
By: Ken Bowlin
Lab & Chesapeake. Hunts. Family pet. The plastic piece does come off simple enough with a heat source such as a blow dry as recommended. My problem with this whistle is I have to constantly remove the plastic piece and adjust(screw in or out) the inside piece to get this whistle to work properly. I am now going to try the acme high pitch whistle and hope it is a better performing whistle.
Product Rating: 2 out of 5-stars. Review ID: 1072 Reviewed: 2011-06-15
Customer Review #4975
By: Michael McAvoy From WA
English Setter. Hunts. Family pet. I still have not found a setting that the dog responds too like he will a regular whistle.
Product Rating: 2 out of 5-stars. Review ID: 4975 Reviewed: 2013-11-04
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Light single body construction
Adjustable tone - Simply remove the black cap to adjust the tone to meet your dog's hearing capabilities
This whistle produces sounds that are insignificant to the human ear but extremely audible to the more sensitive hearing of a dog. While it is not totally silent, this whistle is an excellent means of communication with your best friend without the annoying trill of normal dog whistles. With a range of up to 2 miles with optimum weather and terrain conditions, the European Silent whistle is adjustable for close and long range work.
Adjusting the Tone
Remove the black plastic cap to access the frequency adjustment screw. It is a tight fit, but it should snap off.
With your dog close by, start blowing the whistle. While adjusting the turn screw, observe at what frequency your dog reacts the most. When you can see an obvious reaction, tighten the lock nut and replace the black cover. Take the dog and the whistle outside and do the same thing. The results should be very similar.
GUN DOG SUPPLY - "Serving Hunting & Field Dog Owners Nationally Since 1972."
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