Tunnel Light : It is available in tri-color bright LED lights ( 4 Red, 2 Blue and 2 Green ). This necklace has several light patters that include steady burn, flashing of all colors to slow motion from one color to the next. The image of the lights and mirrored background gives it a multiple light and tunnel look, even though this necklace measures 2 1/2 inches in diameter and a little over 1/2 thickness. It gives a great light show. The light is controlled by a push of a button located on back of the necklace. The necklace housing is mirrored colored and comes with a silver color string for a necklace. Batteries are included and replaceable. Light the party with the hottest Necklace around. High visibility and lots of flash. A happening item at your special event.. Three high powered L.E.D's GREEN, RED, BLUE in a bright metallic case and on a cord.