Orfos Flare [RED] Bike Tail Light 360 Visibility with Pair - Orfos' diffusing optics help you be seen on the road from all angles Incredible Brightness  Up to 300 lumens on the red light. Designed for both day and night use Waterproof - Military grade waterproofing completely sealed in silicone Magnetic Mounting System - Anti-theft and convenient to remove for charging or to swap bikes Rechargeable Internal LiFePO4 Battery - Charges via a micro-USB port