The Cateye Kinetic X2 Rear light is a semi automatic rear light that changes modes depending on your movement. Bringing together the brightness and 180 degree visibility of the Rapid range, the new Kinetic light adds an additional dimension. With a built in sensor which detects the movement of the rider, the beam will automatically change from flash to constant when stopping. The super bright and eye catching red light produces a whopping 50 Lumens which can be noticed from a mile off. Overall this is a simple yet effective rear light that will make road users and pedestrians aware of your position User Type I want to be seen Light Source COB LED Technology Brightness 50 lumens Power Source Li-Polymer rechargeable battery. Run Time - Low mode 5 hrs - Flashing mode 30 hrs - Rapid mode 16 hrs Charge Time 2 hrs (USB2.0) Mounting Tool Free Setpost Light modes 3 Modes Dimensions 74.4 x 30.5 x 32.9mm Front/Rear/Set Rear Extra Features This light does not work completely with braking. Also recommended to attach to the seatpost to maximize the performance of Kinetic mode. Weight 32g (with batteries) CONTACT JEFF 0124442268 <Whatsapp>https://api.whatsapp.com/send?phone=60124442268