It has a twin tuner, tuner A and Tuner B the second tuner is a add on card with a loop connection just under the LNB connection on tuner B
More boxes are going down the "switchable" tuner route.
This box has a soldered sat Tuner A
Tuner B is switchable, so you just plug in another tuner to the board, which means the same box can then be sold as a single sat or twin sat or combo ( sat / cable) version.
If you have got a normal ariel connection for Tuner B you have a combo.
The Xpeed LX2 at £109 from W.O.S has a twin sky tuner mate, I have that box purchased from W.O.S so I can say for certain its what you are looking for.
When it arrives you will see it looks the same as the picture I posted above, also the image I have uploaded to this forum is for that box so use that to get your box up and running really quickly