It didn't take us very long to love these little LED Light Balls. Juggling with them in a darkened room is decidedly attention grabbling, and children love the fact that they're illuminated, colourful and safe to play with. The small size is now on a detachable lanyard, which means it's even easier to create light paintings. Light effects: 3 Mode, 7 colour. Constant on, slow phase & fast phase. 6 super bright LEDs. Batteries included, and replacements available. Small size is approximately the size of a golf ball. The larger size is about the size of a tennis ball. ....... Modes: Constant on, slow phase & fast phaseColors: blue, green, red, purple, cyan, yellow, white.2 bright multicolor LEDs each.GOING SwingSize: ø 5cmWeight: 36gLength of band: 39cm3 x 1.5V (AG10)batteries includedMaterial: Shock resistant polycarbonate core with removable soft grip mantle in elastic TPR dash rubber. Multicolor LED technology for brilliant and precise colours.