If we open another box, further Mode S information available is the Rate of Climb/Descent, aircraft identification (input by the pilot or hard coded in Mode S transponder), and the Mode S hex code.
ROC/ROD is only sent by aircraft fitted with ADS-B, which includes most, but by no means all, Mode S-equipped airliners.
Among the exceptions are MD-80s, CRJs, ERJ-145s, etc.