Knog Cobber Reflex Rear Light. Features: Unique wrap-around design provides 330 degrees of illumination Commuters can be seen from all sides, day or night Super bright 250 lumen output Multiple modes 100% waterproof with IP67 rating Side illumination USB rechargeable via integrated USB-C Includes straps to fit 22-32mm+, standard & aero seat posts Specs: Model:Cobber Reflex Rear Lumens:250 Modes:4 Rechargeable:Yes Color:Black Weight:39g