The Knog PWR Mountain is a modular bike light and this Kit includes the helmet fitting kit and extension cable. But it's not JUST another bike light. Not only is it a high-power headlight, but simply take the product apart and you have much more¦ A PowerBank to charge devices, as well as a battery for all products in the PWR range, you can even purchase accessories to make up complete camping lights, USB Boom or a head torch. The PWR Trail outputs a max 2000 lumens, can run for up to 300 hours on Eco Flash mode, uses an elliptical beam for broader road coverage, can be mounted both on top or under the handlebar (mount under your cycle computer), or your helmet, incorporates twist mode operation (turn the light on and off twisting the light head - no buttons) and gives you the option to program your brightness and runtime through our ModeMaker app. Powerbank capacity 10,000 MaH, Weight 355 gram.