The Tangle Nightball Softball is the perfect ball to play with at night! This bright green ball glows with green light upon impact and movement as you throw, catch, and roll the ball. It's eye catching bright colors also making it suitable for those who are visually challenged. Fantastic bounce, easy to hold and to catch. Totally waterproof. The battery inside of this LED module is non-replaceable. Long-lasting and durable, it lasts up to 150.000 pulses or for over 50 hours of continuous play.