Using this 16mm red latching on/off illuminated pushbutton is a breeze. First, find a suitable spot on your project panel for the button. The medium size makes it easy to fit and press. To connect the LED, note the + and - contacts. Remember to connect a 220 - 1000 ohm resistor in series with the LED when using a 3V or higher power supply. This will protect the LED from too much voltage. When it comes to the switch part, just press the button to change its state between on and off. You can control the LED independently. You can set it to light up when the switch is on, off, or keep it always lit according to your preference. As for maintenance, keep the button clean. Wipe it gently with a dry cloth if it gets dirty. Avoid getting water or other liquids on it as this could damage the electrical components. Also, don't apply excessive force when pressing the button to prevent it from breaking.