Extend fetch time to early mornings and late nights with Chuckits Max Glow Ball. They are made with a safe, high quality photo luminescent material that is both chemically and biologically inert. If your out and about in the dark, they can be recharged in seconds with a bright flashlight. Fun for dark nights and early mornings No batteries required to make them glow, leave in the light for 5 minutes to get around 30 minutes of bright play time fun Shine your mobile phone torch on the ball to get extra charge Durable rubber ball glows in the dark to allow the game to keep going when the sun goes down. Gripable rubber ball made just the right size to use with Chuckit Ball Launchers.