• Built-in bell for sound, quieter than BB whistle, no noise disturbance• Built-in flashing light, glows when bouncing, easy to find at night• High elasticity, suitable for throwing and fetching games on various grounds• Hollow design, lighter weight, safer for dogs to chew and carry• Soft material, gentle on dogs' teeth, no damage to oral cavity• Durable and bite-resistant, suitable for long-term use• Ideal for human-dog interaction, enhances the bond between owner and pet• Unique star and circular hollow design, increases fun of chewing