Using the Lezyne Stick Drive is easy. First, use the simple o - ring to strap the light to your bike's seatpost. When it's time to charge, use the magnetic attachment to separate the light from the mount. Then, plug the integrated USB stick into a power source. There are seven different lighting modes to choose from, including a useful Daytime Flash mode. To get the most out of your light, avoid exposing it to extremely harsh conditions. Although it's water - resistant, don't submerge it for long periods. When not in use, store it in a dry place. Clean the light gently with a soft cloth to keep it in good working condition.