BN series control device unit, Number of devices: 4 devices, Position 1: 1 pushbutton blue 1NO, Position 2: 1 pushbutton green 1NO, Position 3: 2-position key selector switch 1NO , Position 4: 1 red emergency stop button, turn to release, 2NC+1NO, Protection degree: IP65 according to EN 60529, Connection and output direction: M23 connector, 12-pole.