Using the Lezyne Stick Drive Rear Light is a breeze. First, use the O - ring mount to attach it to your bike's seatpost. It fits most seatposts securely. When it's time to charge, just use the magnetic interface to detach the light from the mount. Then plug the integrated USB stick into a power source. The battery can last up to 23 hours, but if you notice the light getting dimmer, it's time to recharge. To keep it in good shape, clean it regularly with a soft, dry cloth. Avoid using harsh chemicals. Also, while it has good water resistance, don't submerge it in water for long periods. With proper use and care, this taillight will serve you well on your cycling adventures.