Using this SurgeX SA - 20 power conditioner is easy. First, find a suitable electrical outlet and plug in the 20A Edison plug of the unit. Then, you can connect your devices to the two outlets on the conditioner. When using, make sure the total power of the connected devices does not exceed the 20A capacity. Keep the unit in a dry and cool place to avoid overheating. As for maintenance, regularly check the plug and outlets for any signs of damage. If you notice any issues, stop using the unit immediately and contact customer service.