Cateye: Safety you’ll never notice, but those around you will.Bringing together the brightness and 180 degree visibility of the Rapid range, the Cateye Rapid X2 Kinetic light adds an additional dimension. With an integrated accelerometer to detect the movement of the rider, the beam will automatically change from flashing mode ( 10 Lumens ) to constant “Burst” mode ( 50 Lumens ) for 2.5 secs under sudden deceleration. Make your presence known with the Rapid Kinetic X2.• Ultra bright strip COB LED technology – maximum 50 Lumen output• USB Li-Polymer rechargeable battery• Versatile rubber band mounting system ( 12-32mm ) for seatposts and seatstays• Kinetic mode• Battery indicator• Battery Auto Save, converts to flashing mode so you’re never left in the dark• Recharge time: 2 hrsMode: Runtime ( when not using Kinetic mode)Constant: 5 hrsRapid: 16 hrsFlashing: 30 hrs