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 robust rubber ball has a protected inner core that contains an advanced motion-activated LED module with bright red or color-changing Disc-O LEDs, and it turns on with a simple bounce. It also features an auto shut-off function after ten minutes without a bounce (5 minutes of glow followed by 5 minutes of flashing), 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. The same size as a tennis ball and invincible to water or slobber, this tough little ball floats, and is great for the dog who loves to swim.