Using the Lezyne KTV Drive Rear taillight is a breeze. First, mount it on your aero - post. Then, turn it on and choose one of the 5 output modes according to your needs. Whether you're riding during the day or at night, this taillight will keep you visible. When it's time to charge, just plug the built - in USB stick into a power source. It'll take about 3 hours to fully charge, and then you'll get up to 20 hours of runtime. As for maintenance, since it's waterproof, you can clean it with a damp cloth. Just make sure to keep it dry when not in use. Don't expose it to extreme temperatures, as this might affect its performance.