1).Product No.: LM-R8 ,Built-in DSP,Bluetooth and UHF module. 2).It provides 5 sound fields : KTV Room sound effect,Concert Hall sound effect,Recording Studio sound effect ,Oringinal sound effect and Cinemas surround sound effect,with 12 EM tone (C,C#,D,D#,E,E#,F,G,G#,A,A#,B),EQ and voice changed for funy playing 3).Used for Sing Karaoke Songs,Sing Songs,Practice Songs,Watch Movie and Record Songs,so the user can sing,record and share their favorite of singing song to their friends by smartphone/iPad or computer. 4).Compatible with iOS and android systems,support all of karaoke APP what was installed in smartphone,so it easy to sing karaoke by smartphone,computer or TV 5).Don't need DVD player any more,the source of karaoke songs are from karaoke APP or karaoke platform via internet/WiFi. 6).Suitable for TV and computer what with external sound system,also suitable for any sound system and speaker(bluetooth or Wifi)