Companies that manufacture products that are compatible with the system include those made by Channel Master, Hitachi, JVC, Matsushita/Panasonic, Thomson (RCA, GE and ProScan), Samsung, Sharp, Sony, LG Group and Toshiba. Since the service is advertiser-supported, the updated program listings are provided to users free-of-charge, regardless of whether they receive their television signal over-the-air or via cable or satellite television. Gemstar also produced EPG computer software bundled with analog NTSC TV tuner cards made by ATI Technologies, particularly the TV Wonder and All-in-Wonder lines. ATI later partnered with TitanTV to provide its digital ATSC cards.