The effect from the LEDs and mirrors in this necklace is just dazzling! 8 multi-color LEDs flash brilliantly to create an infinite tunnel effect that looks like those sci-fi "warp speed" special effects. Many different patterns can be selected, from single color to various color combos, plus different slow fade and fast flash speeds. Each pattern is uniquely different and equally cool. The Infinity Tunnel Necklace measures 2.25" diameter and comes on a black cord necklace. Uses replaceable AG13 batteries (included).