The Gamin Delta from The Collar Clinic might be worth while for you, it vibrates and also has a "tone".
I had a collar that gave a buzz sound that worked really well, distracts the dog from what it is concentrating on (like doing its own thing). Unfortunately it was a cheapo off Grab One and fell apart in the brush down a bank up the forest.
I have a "silent" dog whistle, the large size. You can set the sound range on it so that you can hear it. Better than the normal whistles which are so noisy. You would have to train your dog to respond to it of course. Brittany can be pretty speedy.
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