Cateyes Rapid X2 is a rear rechargeable light that fires out 50 lumens of output with superior side visibility, keeping you visible to other road users without dazzling them. The Cateye Rapid X2 Rechargeable Rear Bike Light is a neat compact safety light with a concealed USB (Universal Serial Bus) port, making it perfect for your daily commute. The strip of wrapped LEDs & open sided design gives you 180 degrees of visibility, keeping you safe & visible to other road users during the day or night, while the integrated lens switch makes it easy to cycle through the 6 light functions from high to pulse modes. The rechargeable USB (Universal Serial Bus) battery keeps you cycling for up to 30 hrs, while the low battery “ Auto Save” function automatically changes the light pattern from the current mode to flashing, providing an additional hour of riding safety. Easy to fit, the Cateye Rapid X2 Rear LED Light comes with a fitting system attachment using a neat O-Ring b&, & it can be placed in several different positions on the bike, from seat post to seat stays.