Yo Ho Electro LED Juggling Ballz Each ball used 2 X CR2032 watch batteries Lasts for over 24 hours of continuous play Includes Yoho's comprehensive instructional CD Rom with over 50 slow motion videos, movies and more Experience the visual celebration of juggling with Yoho's latest Light up Juggling Balls Take your juggling into the night and watch how even the easiest tricks transform into a great display of colour and movement.