Using this yellow 16mm panel mount pushbutton is easy. Just press the button when you need to close the circuit. That's it! When not in use, leave it alone and it'll stay in its normally - open state. As for maintenance, keep it clean and dry. Avoid getting it wet or dirty as this could affect its performance. Also, don't apply excessive force when pressing the button, as it might damage the internal micro - switch. If you notice any issues, like the contacts not closing properly, check for dirt or damage and clean or replace the button if necessary.