The bright LED lights flash sporadically as well as transition slowly from color to color. The necklace is made of diamond-shaped beads, one size able to fit anyone. Dimensions: Height: 1.37 in. , 3.47 cm. Width: 1.37 in. , 3.47 cm. Necklace: 18 in., 45.72 cm. LEDs: Flashing Blue, Red, Orange Color Changing LED Round Flower Necklaces include 3 CR927 Batteries. Batteries for this item are replaceable.