Martin Ranger Pure Sound 88 Recording PS-88R 600W Professional Digital Echo Mixing Karaoke Amplifier with MP3 Recorder and Player. Max Power Output :300. Built-in USB MP3 Recorder and Player. Recording: Singing, Speech and conference. Master Music Volume Control. Music Bass, Mid-range and Treble Adjust. Master Microphone Volume Control. Microphone Echo Volume, Repeat and Delay Control. […]