Petface Hear Doggy Stuffed Penguin Toy Ultrasonic No Squeak Dog / Puppy Play (Pablo or Pierre) Patented squeaker tuned to an ultrasonic frequency that is out of a human range but still fun for your pet Ultrasonic toy that your dog can hear it but you cant Hear Doggy Range Animal shaped dog toy Size: 26 x 16 x 7 cm approx.