Our flexible plastic Green LED 27" Necklaces look great day or night! Each LED necklace features green LED fiber optics throughout. Click the on/off button to choose from 4 exciting flashing light functions. Our green LED necklaces each open, close and attach to each other for a length of light rope. Combine color for school spirit activities and Halloween costumes, too! If your color scheme is Green this green flashing neon necklace is perfect for your attire and decorative needs. 3 AG13 batteries are included, installed & replaceable.