The Chuckit!® Firefly® LED Ball has two ultra-bright, multicolor LED lights inside that make it ideal for night time play year round. The bright LEDs fade between colors creating a constant motion that better helps dogs see the ball when it's not moving. Compatible with medium Chuckit! Launchers for added fun. Durable Translucent TRP construction. Includes instructions for use. Product note: Inspect ball prior to each play session. If the cap is missing or damaged replace ball immediately. The Firefly LED ball is neither a child's toy nor chew toy. It is for supervised fetch play only.