I'm not all that familier with pealess whistles. I recieved a couple Fox40 Howler Whistles in the mail today from a very good company. They arrived fast and in perfect condition. My question is, do all pealess whistles sound like this? I didn't hear any sound that would in any way alert anyone nearby as to my dire situation (if I was in one.) They are for my grandchildren and I know they will not be able to get any whistle sound out of them with their little lungs. So, what whistles are good for kids to have in the wilderness if the pea ones seem not so good?

Thanks.
Michael