Moon Light Shield Defender LED Rear Bike Light USB Rechargeable Moon Light DEFENDER LED REAR Bike Light USB Rechargeable 60 Lumens, CREE XP-E (N4) High-Bright LED. Rechargeable lithium-polymer Battery (3.7 V 700 mAH) USB charging is possible Overcharge protection system, Quick release strap mount Low battery, fully charged notification, High precision optical lens, Waterproof