Using this RED Redvolt Quad Charger is easy. Just plug the charger into a power outlet using the provided power supply. Then connect your devices to the charger's ports. You can charge up to four devices at the same time. When using, make sure the power outlet is working properly. Don't overload the charger by connecting devices that require extremely high power. For maintenance, keep the charger in a dry and cool place. Wipe it with a dry cloth if it gets dirty. Avoid getting it wet as it may damage the charger.