PWR Rider is a 450 lumen bike light that can also be used as a power bank. Includes the option to program your brightness and runtime (through ModeMaker app), then use your remaining battery to charge your devices. The light outputs in an elliptical beam for broader, brighter road coverage; has a 2 hr runtime at max 450 lumens and 4 smart battery indicator LEDs to let the rider know how much charge is left in the light. Fits handlebars: 22.2mm - 31.8mm Ø.