Abrams Unibody Titanium Whistle

Works really well and it's a good size

Sweat little noise maker!

Worth the price. The high pitch of this whistle is sharper and higher than the regular plastic survival whistles on the market. It also takes less effort to make it sound. Dogs also jump to attention. Size: 1.5” long x .75” wide.

Haven't been able to fully test it, but it has a quality feel and weight to it.