Lazer Rollsys Taillight: Fits Lazer Snow Helmets Contains LED light and 2 sets of batteries Kit allows for and LED light to be added to Lazer snow Helmets with Rollsys Replaces lens cap on Helmet with LED light battery and lens in kit Run time is 80 hours in flashing mode and 40 hours in constant mode Includes 2 x 392/384 batteries (BA0135)