Designed with the ball-obsessed pup in mind, this durable rubber ball features bright color-changing Disc-O LEDs. It is motion activated and also has an auto shut-off function after ten minutes giving you time to find it if your dog has gotten distracted, and to optimize the replaceable, long-lasting batteries. The same size as a tennis ball and invincible to water or slobber, this tough little ball is ideal for playing fetch with the ball-loving dog who wants to take it for a swim or play fetch for hours into the night. This ball is not intended as a chew toy, nor is it intended for pets under 12 months old. It is meant for supervised use only and for enjoying playing fetch with your dog. Please tighten the battery cap securely in place using a flathead screwdriver and check the tightness regularly.