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Cyclists and motorists behind you will know when you're slowing down thanks to the TL-LD710-K Rapid X2 Kinetic Rechargeable Rear Bike Light from CatEye. The Kinetic is equipped with a motion sensor that automatically switches the light from a flashing mode to a bright constant-on when you decelerate.
Designed to be used during the day, like running lights on a car, as well as after dark, the Rapid X2 Kinetic will hold a charge for 30 hours in flashing mode, 16 hours in rapid mode, and 5 hours in constant-on low mode. Constant-on high is reserved for deceleration alert. The light has 180-degree visibility so you can be seen from the sides as well as behind.
The light recharges via USB in about two hours. Should the battery run low during a ride, the light automatically steps down to flashing mode to conserve the remaining power.
The Rapid X2 Kinetic's deceleration alert feature does not correspond exactly to braking. It works best when mounted to the seat post.
50-lumen maximum output
Switches to bright, constant-on mode to warn riders & drivers behind you are slowing down
Battery auto-save steps down to power-saving flash mode when battery gets low