Pet Qwerks® Plush Chattering hedgehogs are fun and interactive plush dog toys that entice your dog into play. Great for small and medium-sized dogs, these Plush Hedgehogs are soft, comforting toys that make great cuddles and playtime companions. As your dog squeezes its belly, the chattering ensues, enticing and keeping your pet interested and engaged in play. The sound module inside the Heggie contains 2 batteries, model: AG3, 1.5V. Product Note: The Plush Chattering Hedgehog is not suited for power chewers.