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