The Lezyne Femto Drive is compact, lightweight and safe. Ensure you are always seen with the Femto Drive. The lens is made out of high quality optical material and serves as an activation button for the various lighting options. The CNC-machined aluminium casing makes the Femto Drive durable and weatherproof. You can unscrew the matric backplate to replace the two CR2032 batteries. The multi-position silicon rubber strap ensures it fits a wide range of handlebar and seatpost diameters.