The Specialized Stix Switch flips from redlight to white light so you can mount it on the front or back of your bike. Its Fresnel lens maximizes light in every direction regardless of the light you have on, and a single switch cycles through various modes to give the right light throughout the day and night. The USB-rechargeable battery includes an indicator so you know when it's time to charge. Specialized made it with a flexible mounting system works with most seat stays, handlebars, and seatposts.