Happy Birthday Star Flashing Necklaces are the icing on the birthday cake! These wonderfully bright LEDs will light up your birthday and keep all eyes on you! The Body Light is attached to the non flashing beaded necklace. Happy Birthday Star Flashing Necklaces fit over your head and turns on by twisting the battery housing on the back of the body light. Get more light out of your special occasions with Flashing Necklaces! Dimensions: Height: 2.68 in. Width: 2.68 in. Beaded Necklace: Approx. 35 in. Necklace Colors: Assorted. LED Colors: 11 Red. Batteries: Includes 2 CR927 Batteries. Batteries for this item are replaceable.