Nite Ize Glowstreak Disc-O LED Ball - 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 with an advanced motion-activated LED module with color-changing Disc-O LEDs, 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 if one of you becomes distracted. The molded, shockproof, removable polycarbonate core houses the LED/battery module and screws securely into place to create a waterproof seal. The same size as a tennis ball and invincible to water or slobber, this tough little ball also floats for the dog who loves to swim. The unique grooved design on the surface creates a bite-friendly exterior that is easy to pick up for small and large dogs alike. Powered by replaceable, long-lasting CR2032 3V batteries, GlowStreak provides up to 35 hours of playtime. Features: Durable LED ball great for nighttime play Fun, color-changing Disc-O LED pattern Motion activated - bounce to turn on Auto shut-off after 10 minutes of inactivity (5 minutes of glow followed by 5 minutes of flashing) Fits most ball launchers Durable rubber construction Waterproof - it floats! Two easily replaceable CR2032 3V batteries included Run time: 35 hours