The Cateye Rapid Micro USB Rechargeable Rear Light is small in size but big on safety. The Rapid Micro is Cateye’s smallest and most affordable rechargeable rear light. Superior visibility day or night.Cateye Rapid Micro USB Rechargeable Rear Light Features3 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 hrsCateye Rapid Micro USB Rechargeable Rear Light SpecificationsMode: Output, RuntimeConstant: 15Lm, 3 hrsRapid: 15Lm, 5 hrsGroup Ride (low pulse): 15Lm, 20 hrsFlashing: 15Lm, 30 hrs