There are 2 tuner slots
The 1st slot can take a dvb-s2 or -c/T2 and for dvb-s2 provides 2 dvb-s2 tuners
The 2nd slot if used for dvb-s2 only provides 1 dvb-s2 tuner
So max 3 x dvb-s2
So if you have as per the advert 2 x dvb-s2 pairs =4 but only 3 useable (which it doesn,t say) or maybe its in the small text or probably the seller hasn,t read the details