GSMCB-02 Power Master ( PowerMaster ) GSMCB02 Main Electronic Control Board: Ciruit Board Used On Models: MBG Arm Barrier , RSW Swing Gate Operators, MSW Swing Gate Openers, RSG 2000 Sliding Gate Openers This is for the Gate Opener Power Master the new model. Model # of this Circuit Board is GSMCB02 a much larger board than previous boards and also UL approved. For the SG Heavy commercial units the model # GSMCB01 was used, make sure to match model #