Using the Lezyne KTV Drive Pro 300+ Front Light is easy. First, charge the light using a USB - C charger (you'll need to provide the cable). Once charged, you can choose from six different output modes to suit your cycling needs. To turn it on, simply press the button. For daily use, the Daytime Flash mode is a great option as it makes you more visible to others. When riding at night, you can select a mode with higher lumens for better illumination. As for maintenance, since it's IPX7 waterproof, you don't have to worry too much about light rain or splashes. But after a long ride in wet conditions, it's a good idea to dry it with a soft cloth. Also, store it in a cool and dry place when not in use. Avoid dropping the light as it may damage the internal components. If you notice the battery life decreasing significantly, it might be time to replace the battery.