TBS5990 is a dual tuner digital satellite TV external box with integrated dual CI slots for watching and recording digital satellite TV on PC. Its use USB connection to connect with laptop or desk PC , it can be used for watching and recoding Free to Air TV programmer and Pay TV programmer as well. inserting the correct CAM and subscription smartcard into the CI slot can encrypt pay TV programmer. So you may use one tuner to watch one digital satellite TV channel while using the other tuner to watch/recode another pay TV channel from another transponder/satellite at same time. Both Windows BDA driver and Linux driver up to the latest kernel are provided. The unique TBS MCE tool makes it possible to read CAM/Smartcard on Windows7 Media Center, thus your satellite subscription TV can be watched/recorded on Windows7 Media Center. On Linux platform, you can also watch paytv by using correct software. TBS5990 is compatible with Windows7 Media Center, MediaPortal, DVBlink, DVBDream, DVBViewer, ProgDVB, Skynet, TSreader, XBMC, MythTV, VDR and many other popular software.