This compact, super lightweight, LED bicycle light offers six combined solid and flash output modes. Featuring the impossible-to-miss, 15-lumens Day flash Mode to the impressive 12-hour runtime in Femto mode, the Femto USB-C Rear can cut through urban landscapes in a variety of conditions. Wide-Angle Optics provides 270° of visibility and the durable co-molded construction features an IPX7 water-resistance rating, ensuring optimal functionality in the toughest weather conditions. The Femto's versatile rubber mounting strap quickly and securely mounts to various seat post sizes and a waterproof, threaded Composite Matrix cover keeps the USB-C charging port sealed from dirt and debris.