The Sirrah is a powerful and reliable 500-lumen front bike light that is more than capable of showing you the way to your destination, and most importantly makes your presence known! The Sirrah 500 from ETC comes with two mounts, a handlebar mount and a helmet mount. If you are wearing the light on your helmet, you can make use of the Sirrah 500's rear red light to increase your chances of being seen in the darker hours of the day. The light sports a lithium battery which saves the need of carrying spare batteries, you can simply USB charge the light before each journey whether at home, at work or on-the-move during the day. Features four lighting modes and runtime of up to 8.5hours, depending on your choice of lighting modes. The IPX5 waterproof rating makes this an extremely reliable bike light for all-weather cyclists!