The polystar pv-bk722c bluetooth dvd home theatre system features a 5.1 channel sorround digital output. Compatible with pal/ntsc tv system, it supports 16:9 and 4:3 tv picture modes. It is also compatible with dvd/vcd/svcd/cd/mp3/hdcd/cd-r/cd-rw/kodak picture cd. With dolby ac-3 decoder output, it has free code that makes it compatible for all area-coded dvd. Some other features include digital echo karaoke, auto-following&singing, individual volume control, 8-language selection and 32-language subtitle setting, y-cb cr component output, composite video and s-video output.