Using this Gravity digital self - locking switch module is a breeze. First, connect it to your Arduino I/O Expansion Shield using the provided Gravity digital 3 - pin cable. Once connected, power on your Arduino. You can then control the switch by simply pressing the button. Press it once to turn on whatever device or function it's connected to, and press it again to turn it off. When it comes to maintenance, keep it in a dry and clean environment. Avoid exposing it to excessive dust or moisture. If you're not using it for a long time, it's a good idea to store it in a protective case. Also, make sure the operating voltage stays within the +3.3 - 5V range to prevent any damage to the module.