Our brightly colored LED Disco Necklace features red, blue and green LEDs within multi color metallic plastic ball on a 28" cord necklace. Click the on/off switch to choose from 6 different light settings. Our Rainbow LED Disco Ball Necklace is fun for everyone and makes a statement night or day. Each Rainbow ball necklace includes 3 AG13 batteries included, installed and are replaceable. US Patent Number: 10,064,461