t’s time for road safety to run ‘round the clock. Introducing the Rapid X2 Kinetic, a movement-sensitive, day and nighttime light for your ride. The Rapid X2 Kinetic is a 50-lumen, USB rechargeable safety light that mounts easily on your seatpost. A built-in accelerometer automatically switches into a constant burst mode when it senses a sudden change in speed. Similar to daytime running lights on an automobile, the Rapid X2 Kinetic helps make your presence known as a cyclist. 180 degrees of visibility allows you to be seen from varied perspectives. A Battery Auto-Save feature makes sure you’re covered the entire ride by automatically switching to a flashing mode should the battery run low.\nWith up to 30 hours of runtime, the Rapid X2 Kinetic ensures you’ll be drained from your ride long before your light is.\n\n【Built-In Acceleration Sensor for Kinetic function】\nAutomatically turns on High for 2.5 sec when bike deceleration is detected.