PWR Rider Duo is a 450 lumen front and a 12 lumen rear 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 front light outputs in an elliptical beam for broader, brighter road coverage while the rear light has a narrow bean for day and night visibility. The PWR Rider Duo comes with 7 pre-programmed modes, just in case you haven't yet discovered the ModeMaker app. It will last 2 hours at 450 lumens, and for those with stamina, will run at 200 lumens for 5 hours. Using RedCap will slightly reduce these runtimes depending on its mode.