To activate the LEDs on your Happy Holidays Blinkies with Beaded Necklace, remove the plastic tab & turn the battery pack clockwise. Lights will blink from LED to LED, and turn counter-clockwise to power off. 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: Silver LED Colors: 3 White Includes 2 replaceable CR927 Batteries.