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MODE S BLK NVG DISP 1/2 O/O 071-01619-0202PS 550 Control Unit | Black Faceplate, NVG Display, Dual, ON/OFFThe PS 550 is a Control Unit for use with the MST 67A Enhanced Mode S Transponder. It contains all controls required for transponder operation including TEST, STANDBY, ON (transponder), ALTITUDE..