Not silent at all
Verified Buyer Reviewed by Snyder family from New Mexico on Thursday, August 18, 2016
Was really hoping this dog whistle could help control our dog out on trail hikes and runs, but it just doesn't seem to be have a pitch that she can register and it's certainly not silent. It was held together with an adjustable valve, but it's so loose, that it falls apart in our backpack, so you are searching for pieces of it in the bottom of the pack. Not very handy.