Using the Fenix HL18R-T is a breeze. First, choose your power source. You can either insert the included ARB-LP1300 Li-polymer battery pack or 3 AAA batteries. To turn it on, use the dual switches for easy and fast operation. You can select from three spotlight and two floodlight output levels to suit your needs. When it's time to charge, use the included Micro USB cord and plug it into a 5V/1A power source. The battery level indicator will let you know how much power is left. For the headband, you can adjust it with one hand using the patented rotary push-pull clasp. As for maintenance, keep it clean with a soft, dry cloth. Avoid exposing it to extreme temperatures or moisture. Don't try to charge the AAA Ni-MH/Alkaline batteries as it's prohibited. Also, use the lockout function when you're not using the headlamp to avoid accidental activation.