Easy programming! Control for 4 twin coil solenoid type switch machines. Supports the full range of DCC accessory addresses (1-2044). Runs from track power or external 9-15V DC power supply (sold separately). Easy address programming - no need to connect it to programming track. Inputs for local control and panel push buttons. Simple hook up: 2 wires to the track, 2 wires to each switch machine.