DCD-DSR Cobalt AlphaSwitch-D for Digital Devices Red (12)The DCD DSG, DSR, DSB & DSW models have a 3 wire output on the PCB and are designed to connect to and control all digital devices that have 3 wire left right control needs. The outputs are +5v 0v so you can use these switches to drive computer or DCC control at the same time. These switch packs are independent of train driving preferences. They can be used for the control of Accessories on AC, DC or DCC layouts. These switches are recommended for use