The Logan 304 Turbo Whistle is precisely manufactured by Logan Whistles in the UK from a solid piece of high quality stainless steel. Features with our unique turbo two-hole design - this changes the sound colour (or "voice") of the whistling sound, which helps dogs hear the sounds against extreme interference from wind, fog, echoes from trees/rocks even traffic/human roar. Widely used in the Shepherd test competition, but suitable for all dog breeds and sports. Includes adjustable leather whistle bag with lanyard.