The DB5 Booster adds an additional 5 Amp section of power to your DCC railroad.The DB5, 5 Amp booster may be added to the SB5 for more power handling on larger layouts.This manual covers only the addition and installation of the DB5 to an SB5 system. For operation of DCC, consult your system manual. Use only the power supply included with the DB5. Use of another supply will void the warranty. Output voltage options are 13.8v and 12v only. Includes internationally approved and 12" control bus cable for connection to the SB5.