Using this indicator light is easy. First, make sure your equipment is turned off and unplugged. Then, connect the 6.4mm spade terminals to the appropriate terminals on your device. Once connected, you can turn your equipment back on and the light should work. As for maintenance, keep it clean by gently wiping it with a dry cloth. Avoid using harsh chemicals or abrasive materials. When the light stops working, check the connections first. If they are okay, the light might need to be replaced. Always handle the light carefully to avoid damage. And remember, this light is designed for 240VAC use only, so don't use it with other voltage sources.