Outstanding brightness the cateye rapid x3 rear light is the brightest and most all round visible rear light available now with increased lumen output cateye rapid x3 rear light features 150 lumen output twin cob led strips 6 modes high low flashing rapid pulse vibration runtime 1 30 hrs depending on mode battery li ion rc recharge time 3 hours battery auto save auto flash spacer x c 2 clip options aero post compatible o ring attachment