This set is for preventing interference with radio/television/cell phone reception. The set consists of a circuit board with set-screw clips and wire to connect to a locomotive controller. It is intended for installation between an analog locomotive controller and the track layout. The set is designed for a maximum 5 amps user current. Recommended for the Central Station and for analog train controllers with up to 5 amps output current. This interference suppression set is required for analog model train operation (example: with 51079) in the EU and in the USA.