Using this fiber optic light source is easy. First, make sure you have a power supply that can provide 9 - 12V and 100mA of current. Connect the light source to the power supply. Then, loosen the clear knob on the LED emitter. Slide one of our fiber optic tubes into the emitter. You're all set to enjoy the beautiful lighting effect. Remember, this is just the LED part, so you need to buy a fiber optic tube separately. When it comes to maintenance, keep the light source in a dry and clean place. Avoid touching the LED directly with your hands as it might affect its performance. If you notice any issues with the light, check the power connection first. That's all you need to know to use and take care of your fiber optic light source.