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The Cateye Rapid X2 Kinetic LED taillight integrates a motion sensor that activates the light when you slow down and stop.
Cateye Rapid X2 Kinetic is a useful light both day and night.
It has a power of 50 Lumens, is USB rechargeable and can be easily mounted to the seatpost. Safe feature that allows light to flash when the battery is low using less energy.
Autonomy of 30 hours that can accompany you on different bike rides.