Power supply units are an optimal solution for operating a system without having to load the installed batteries. With a voltage of 230 volts, the power supplies provide Carhifi systems with sufficient power. In addition, they can be used to charge the installed batteries. Another advantage: power supply units are ideal for using car audio equipment in your own four walls. Since Carhifi products only use 12-volt power supplies, external power supplies offer the option of operating the equipment on the 230-volt mains supply at home.