The Coastal Pet Remington Deluxe High-Frequency Whistle produces a steady, high pitched and clear tone. It is a multi-functional whistle that comes equipped with a thermometer and a compass on either side. This is great for quick reference and it also eliminates the need for having multiple tools on hand. The hunting dog whistle generates a loud, rolling, shrill tone that carries well through many settings including marshes and fields. Since it does not freeze in cold weather, it works well in a variety of weather conditions. In addition, this whistle is a preferred choice of pointer and spaniel trainers. The Coastal Pet Remington Deluxe High-Frequency Whistle is a fine choice for any dog trainer.