Using this Volta Dolphin U5001 mains on - off switch is easy. Just connect the 4.8mm spade terminals to the appropriate power source in your vacuum cleaner. When you want to turn on the vacuum, simply press the 6mm X 6mm button. For safety, always make sure the vacuum is unplugged before installing or removing the switch. As for maintenance, keep the switch clean from dust and debris. Wipe it gently with a dry cloth every few months. If you notice any problems like the switch not working properly, stop using the vacuum and check the connections first. If the issue persists, contact a professional.