<p>This set is for preventing interference with radio/television/cell phone reception. The set consists of a circuit board with set-screw clips. One set is required for each conventional and digital power circuit. The set is designed for a maximum 5 amps user current.</p> <p>Recommended for the Central Station and for analog train controllers with up to 5 amps output current.</p> <p><strong>The FCC interference suppression set is required only in the USA!</strong></p>