Aloha! To activate your Light Up Lei, push in the knob located on the white plastic piece. The first light function is a quick flash of all LEDs, the second light function a still steady light. Light Up Leis do not have a clasp to open, so simply slip over your head to wear. Dimensions: Length: 34 inches & 24 Flowers LED Colors: 2 White, 2 Red, 2 Blue Hawaiian Leis includes 3 replaceable AG10 Batteries.