The Magic Star Necklace shifts through 7 magical colors in a continuous gradual cycle. The effect is mesmerizing yet soothing, guaranteeing everyone within eyesight will be drawn to your necklace. The Magic Star color-morphing necklace is activated by a reversible magnetic clasp so the necklace can be worn with the light effect on or off. Uses two long-lasting CR927 lithium batteries (preinstalled), plus comes with an extra replacement set of batteries. Each Magic Star pendant is approximately 1" diameter.