Our flexible blue plastic neon necklaces look great day or night! Each LED necklace features blue LED fiber optics throughout. Click the on/off button to choose from 4 exciting flashing light functions. Our bold blue LED necklaces each open, close and attach to each other for a length of light rope. Use our fiber optic necklaces to decorate for parties, parades, floats, bars and more. Combine color for school spirit activities and Halloween costumes, too! Add blue and white for Hanukkah and Mitzvahs, too! If your color scheme is Blue this blue flashing neon necklace is perfect for your attire and decorative needs. 3 AG13 batteries are included and installed and can be replaced.