The Arch AOC-3.3S PCB Power supply is a compact and efficient power supply unit that provides a consistent 4 watt output at 3.3 volts. As part of the Switching Mode Power Supplies category, this product is designed for use in various electrical equipment and industrial applications. With the brand name of Arch, known for its quality and reliability, this power supply is a versatile option for businesses and industrial settings requiring a stable and dependable source of power.