Planet Bike Spok Lights and Set. Features: Great supplimentary USB chargeable lights for on bike to be seen or helmet usage that use easy to install rubber straps for a no tool application Dust and water resistance rated to IP54 standard Side cutouts provide 270 degrees of visibility Up to 22 hours run time. Steady, Courtesy, and Superflash modes Includes: rubber strap mount compatible with almost all bars and seatposts and USB charger cable Avalable as a set or individually