The GlowStreak LED Ball is the most technologically advanced nighttime fetch ball ever made, and holds up to the best arm or ball launchers around. This tough rubber ball has a protected inner core that contains an advanced motion-activated LED module with bright red or color-changing Disc-O LED's, and it turns on with a simple bounce. It also features an auto shut-off function after ten minutes of inactivity and flashes in warning before shutting off, giving you or your dog time to find it if one of you becomes distracted. The molded, shockproof, removable polycarbonate core houses the LED/battery module and screws securely into place creating a waterproof seal. Invincible to water or slobber, this tough little ball floats, and is great for the dog who loves to swim. Powered by replaceable, long-lasting batteries. The GlowStreak is also available in a combo pack with the SpotLit LED Collar light so you can keep track of your dog and the ball. The SpotLit is a water resistant, durable LED that clips easily to your dog's collar with its integrated Stainless-Steel carabiner clip. This Disc-O SpotLit can be set to a color-changing glow or red-flashing mode with a simple push of a button. Powered by replaceable long-lasting batteries, you are sure to find the SpotLit to be an excellent addition to your GlowStreak light show of nighttime fetch. This ball is NOT A CHEW TOY, and not for pets under 12 months old. It is meant for supervised use only and for enjoying playing fetch with your dog. Tighten the battery cap securely in place using a Flathead screwdriver and check tightness regularly.