Boing swing balls change colour with one squeeze of the hand. Covered in a n ergonomically designed ribbed rubber they are perfect for dazzling juggling shows, magic games or just cool tactile mood lights. Choose from 3 light modes (constant colour, slow phase and fast phase) and 7 colours. Move from one to the next simply by squeezing the ball. The swing is a small Boing mounted on a lanyard for wearing around tour neck or for dazzling swinging effects! Uses replacement button batteries (included). Also available in larger and smaller sizes.