Using the Portland Design Work BYOB Headlight is easy. First, connect the headlight to your portable power bank via the USB - A port. You can then decide whether to mount it on your handlebars using the handlebar mount for easy removal, or bolt it to the fork crown for a more permanent setup. When you're out and about, if your power bank runs out of juice, just swap it with a fully - charged one. For longer trips, carry multiple power banks with you. Store them in a handlebar bag, frame bag, or basket, or strap them to your stem or top tube. Remember, the power bank is not included with the headlight, so you'll need to buy one separately. As for maintenance, since it has a weatherproof machined alloy body, it can withstand some exposure to the elements. But after riding in wet conditions, it's a good idea to dry it off to keep it in top shape. Also, check the connection between the headlight and the power bank regularly to make sure it's secure.