BN series control device unit, Number of devices: 4 devices, Position 1: 2-position selector switch 1NO , Position 2: 1 pushbutton blue 1NO, Position 3: 1 pushbutton yellow 1NO, Position 4: 1 red emergency stop button, turn to release, 2NC , Protection degree: IP65 according to EN 60529, Connection and output direction: M12 connector, 12-pole, at bottom.