Compact and lightweight USB-rechargeable LED cycling taillight- Durable co-molded construction is minimal and has an IPX7 waterproof rating- Versatile mounting strap quickly mounts to a variety of post sizes- Five output modes offer up to 5-lumens and the custom Wide Angle Optics lens provides up to 270deg of visibility- Femto USB Rear can run for up to 15 hours and is easily rechargeable with the included Micro USB cable- Secure, threaded Composite Matrix cover keeps the USB port clean and sealed