Alfie Pet by Petoga Couture - Ceylon Dog Training Whistle with Microfiber Fast-Dry Towel Ceylon measures 2.1" height x 0.3" width, has an adjustable slider for active control of the frequency. Easy to use. Product comes with a detailed instruction card and Alfie cloth bag for easy storage. Trainers may use the whistle simply to gather a dog's attention or behavior modification. A dog whistle is a type of whistle that emits sound in the ultrasonic range, which people cannot hear but other animals can, including dogs and domestic cats, and is used in their training. The advantage of the dog whistle is that it doesn't produce a loud irritating noise for humans that a normal whistle would produce, so it can be used to train or command animals without disturbing nearby people. Alfie Microfiber Fast-Dry Pet Drying Towel is made of a specially designed, ultra-tightly woven material, known for its excellent absorption and ultra-fast drying speed. Measures 12.75 x 12.75 - washcloth size. Absorb up to eight times its own weight in water, quickly allowing you to dry your pet much faster than traditional cotton towels. Product comes with Alfie Signature fabric storage bag for convenience and protection for years to come.