Diamond TVW750USB ATI Theater HD 750 USB TV Tuner ATSC, DVB-T,Clear-QAM Digital TV Support (unencrypted digital TV), PAL, SECAM. Intelligent Image Enhancement, Software MPEG Encoding, 12-bit Resolution Audio and Video Decoder. Please refer the user manual under product details for proper usage and troubleshooting steps. Must set the TV software on one channel usually 3 and then change channels manually on the set top box. Serial number for the software is located on the CD sleeve. Please refer the User Manual and the Installation & trouble shooting steps given beneath the Product Detail before use.