Nite Ize GlowStreak LED Dog Ball, Lights Up for Night Play Color:Disc-O Pack of 2COMBO PACK Combine fun and safety with this color changing LED ball and collar light combination. DURABLE, SLOBBER PROOF LIGHT UP DOG BALL The bright LEDs in this tough rubber ball live under the secure screw top cap BOUNCE ACTIVATED BALL Simply bounce once to turn the ball on even that is fun! AUTO SHUT OFF WITH 10 MINUTES OF INACTIVITY Dont worry about running the batteries out, once your dog has stopped playing, the ball will automatically turn off