The 535 whistle has a variable single frequency between 5200 and 12800Hz to enable the user to select and set the exact frequency required. That is suitable for all breeds of dog for close/medium and distance work. Even if very loud to the dog, this sound isn’t ready to be heard by the human user hence the “silent” label. Then again the whistle is engineered to produce a somewhat quiet whistle sound audible in the human range the sole purpose of That is to reassure the user that a sound in the required range is being produced. It is because if the whistle is incorrectly set up when selecting the frequency then it’s going to not function properly without this facility the user won’t realise the whistle isn’t working.
Whistle had Adjustable Frequency
Protective end cap
Quiet human audible sound to confirm whistle is working
Then again the whistle is engineered to produce a somewhat quiet whistle sound audible in the human range the sole purpose of That is to reassure the user that a sound in the required range is being produced
It is because if the whistle is incorrectly set up when selecting the frequency then it’s going to not function properly without this facility the user won’t realise the whistle isn’t working
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