Aloha! There are two flash functions for this bracelet. Simply press the knob in that is located on the battery pack to turn on, off or to change the light function. Set your Red, White and Blue Hawaiian Lei Bracelet to a quick flash or leave the LEDs on a constant light function. Dimensions: Length: 5 in. , 12.7 cm. LED Colors: 1 White, 1 Red, 1 Blue Red, White and Blue Hawaiian Lei Light Up Bracelets include 3 replaceable AG10 Batteries.