Our LED Disco Diamonds Bead Necklace is 36" long and features 6 super bright LED's in a  diamond-shaped bead that lights in neon blue, pink, and yellow among the white pearl-like beads. Perfect for disco nights, party favors, and blacklight events to light the night. Our 36" LED jewel necklace is powered by 3 AG13 batteries included and installed. Please order in increments of 1 necklace.