Features for increased safety and visibility during all leisure activities and for participation in road traffic ideal for multiple use of the Lenz lithium packs the whole year through fits over all garments or bagpack and, thanks to the adjustability of the abdominal belt, fits all adult sizes quickly put on / removed via the fast-action fastener on the waist small stowage size active lighting thanks to integrated LED strips and passive lighting thanks to reflecting fluorescent strips 3 levels of brightness adjustable further lighting effects possible from the 2016 generation of batteries: the brightness can be infinitely dimmed, there is a choice of red and white, permanent light or flashing light. all functions can also be set via the Lenz heat app Lighting period: 14-40 hours