GIANT Numen Alumbra TL Bike Helmet Light Designed to integrate seamlessly with compatible Giant and Liv helmets, the Numen Alumbra TL is the slimmest and most lightweight helmet-attachable tail light and features a unique quick lock design for easy on and off as well as a built-in low-power indicator. Features Maximum output to 20 lumens ANSI certified lumens and runtime IPX4 water resistant Power status indicator alerts remaining run-time before powering off Light memory mode Compatible with Rev Comp, Compel, Roost, Strive, Lanza, Coveta, Rev Liv Comp and Luta series helmets
