Using your Cateye light set is a breeze. For the HL - EL135 front light, first insert two AA batteries. To turn it on, find the power switch. You can choose between the constant mode for a steady light and the flashing mode for better visibility. When you're done, turn it off to save battery. For the ORB rear light, insert two CR2032 batteries. Press the lens (which is the switch) to cycle through the three modes: rapid flash, slow flash, and constant light. Attach it to your seatpost, helmet, or bag using the rubber band. Make sure it's secure. As for maintenance, keep the lights clean. Wipe them with a soft, dry cloth regularly. When the batteries run out, replace them with the same type. Avoid exposing the lights to extreme heat or moisture. This will help your Cateye light set last a long time and keep you safe on your rides.