Instructions: To activate the LEDs your Merry Christmas Blinkies with Beaded Necklace simply remove the plastic tab and twist the battery pack. Once you twist the back so that the LEDs are on, the lights will flash changing light sequences. Dimensions: Height: 1.75 in. , 4.45 cm. Width: 2.00 in. , 5.08 cm. Beaded Necklace: Approx. 35 in. , 88.90 cm. Bead Necklace Colors: Red, Green LED Colors: 1 Red, 1 White, 1 Green Batteries: Includes 2 CR927 Batteries. Batteries for this item are replaceable.