The goDog Holiday Collection Silent Squeak Ball Dog Toy with Ultrasonic Squeaker is an ultrasonic toy that only dogs can hear! Perfect for working from home, watching TV, and nighttime. goDog Silent Squeak toys are perfect for playtime, anytime! Features: Squeaker Balls made with soft yet durable TPR, in easy to spot bright festive colors. Designed to bounce erratically and silently squeak with every bounce and bite.