Using your Knog Plug Twinpack bike lights is a breeze. To turn the lights on or off, just press the oversized soft - touch button. It works well even if you're wearing gloves. For charging, locate the micro USB port behind the large rear button and connect it to a power source. It takes about 2.5 hours to recharge from flat. When riding, the front light with 250 lumens and the rear with 10 lumens will give you great visibility. Keep an eye on the low - battery indicator in the rear Plug's lens. When it shows low, it's time to recharge. As for maintenance, keep the lights clean and dry. Avoid exposing them to extreme temperatures or rough handling. With proper use and care, these lights will serve you well for many rides.