Our Fun Light Up Green Shamrock Necklace features 7 - 3D plastic shamrocks that light up and flash! Get ready for everyone's favorite parade and wear our great looking necklace all day and night. With a push of the on/off button choose from 4 multiple flashing settings and a steady on setting. 2 CR2032 batteries are included and installed. This St. Patrick's Day necklace is sure to be a fan favorite at any St. Paddy's Day celebration.