Using the Lezyne Micro Drive Pro 800XL is easy. First, use the versatile and secure mounting strap to attach the light to your bike. Then, charge it via the micro - USB port. Once charged, you can choose from eight unique output modes to suit your needs. During the day, the powerful Daytime Flash mode makes you highly visible. At night, the high - lumen output lights up your way. As for maintenance, keep the light clean and dry. Avoid exposing it to extreme temperatures. If you use the Remote Switch, make sure it's properly paired with the light. That's it, and you're all set to enjoy a great cycling experience with this awesome light.