The Specialized Stix Switch 2-Pack consists of two versatile bike lights that interchange from red to white lights so you can outfit them on headlights and taillights. Their Fresnel lenses maximize light in every direction regardless of the light you have on, and the single switches cycle through various modes to give the right light throughout the day and night. The USB-rechargeable batteries include indicators so you know when they need a charge. Specialized made them with a flexible mounting system works with most seat stays, handlebars, and seatposts.