Aplication:1. As ECHO Mixer for Speaker.2. Support Website Karaoke(Karaoke online).3. Support Karaoke on PC or TV4. Echo partner for conference.Function:1. Make Echo for the sound of speaker2. With AV in&out， can connect wth PC or TV or Amplifier.3. Have button to adjust voice of the music， volum of speaker， Echo and Tone.Features:1. With 2 Microphone input.2. With 2 Microphone Volum Controller.3. With Tone Controller.4. With Echo Contronller.5. With AV input and AV output.6. With Misic Volum Controller.7. Power light.8. power switch.Specifications:1. Power Adapter 9-12VDC2. Input voltage: 100V-240V3. Karaoke Sound Mixer (ABS material)4. Product Size:140mm X 85mm X 40mmPackage included:1 x Black Karaoke echo mixer 1 x power adapter plug US plug1 set of audio cable1 set of video cable