CatEye: Superior visibility day or night Small in size but big on safety, the Rapid Micro is Cateye’s smallest and most affordable rechargeable rear light. 3 x red SMD LEDs – 15 Lumen outputUSB Li-Ion rechargeable batterySupersonically welded for weather resistanceMounting bracket 21.5 – 32mmLight mode memoryBattery indicatorBattery Auto Save, converts to flashing mode so you’re never left in the darkRecharge time: 2 hrs Mode: Output, RuntimeConstant: 15Lm, 3 hrsRapid: 15Lm, 5 hrsGroup Ride (low pulse): 15Lm, 20 hrs Flashing: 15Lm, 30 hrs