Lezyne Stick Drive Taillight: Innovative cycling taillight featuring an integrated machined aluminum 35.4 MM seat clamp. By replacing the seat clamp with a slender, lightweight design, the Stick Drive Seat Clamp reduces hardware and saves spaceideal for mountain bikes with dropper-style seatposts. Eight high-powered LED emitters offer top visibility and seven output modes, including a daytime flash mode (up to 30 lumens) and our Wide-Angle Optics for up to 270-degree of visibility. An innovative magnetic interface allows the light to easily detach from the mount for quick and easy charging accessibility. The light itself is housed in a co-molded Composite Matrix body thats durable and features an IPX7 waterproof rating. A built-in USB stick allows for cable-free charging and up to 23 hours of runtime.