The Giant Numen+ Uniclip rear tail light, is a unit that fits into compatible Giant saddles. Increase your visibility with the integrated, lightweight, USB rechargeable light with up to 30 hours run time, and an innovative auto mode so you’re covered in every eventuality.Key Features:Output: 4 bright LEDs. 20 lumensModes: 3, day / steady / flashing / nightPower: USB rechargeable Li-polymerCase: Light weight tough plastic caseRun time: Up to 30 hrs,Mount: Uniclip saddle integrationExtra: Motion sensors with auto modeColour: BlackCompatible with SL, SLR, Contact and Contact comfort saddles – Please check compatibility before ordering.