The Huck 'N Tuck GlowStreak combination pack ensures that fetch doesn't have to stop just because the sun goes down. By combining the Huck 'N Tuck withthe acclaimed GlowStreak waterproof color-changing LED ball, you and your dog can play fetch all day or nite. This robust rubber ball has a protected inner core that contains an advanced motion-activated LED module with bright color-changing Disc-O LEDs. The GlowStreak is motion activated and 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.