These glow in the dark bracelets comes with three functions: slow flashing, fast flashing and solid lighting. To activate, just press the button inside of the bracelet. Ideal for varies of events and occasions, like Parties, Birthdays, Festivals, Halloween, Weddings, Night Activities, New Year¡¯s Eve celebrations and more. Batteries included and installed for a long time using. Available in variety of vibrant colors. QUR for motion / sound activated options.