A strobe LED set on a deliberate angle of 12° so it's always grabbing maximum attention, helping distinguish riders from other road users, particularly at long distance Chip on Board (COB) LEDs provide maximum brightness level for up to 90% of the battery burn time Super bright 150 lumen output 9 eye catching modes 100% waterproof with IP67 rating Side illumination via lens geometry USB rechargeable battery Integrated USBA connector (cablefree) Up to 50 hr runtime Low battery & charge indicator Includes straps to fit 2232mm+, standard & aero seat posts