VocoPro DA-3700 PRO Mic Digital Echo Karaoke Mixer. The item “VocoPro DA-3700 PRO Mic Digital Echo Karaoke Mixer” is in sale since Saturday, June 8, 2019. This item is in the category “Musical Instruments & Gear\Karaoke Entertainment\Karaoke Mixers”. The seller is “hoanl86″ and is located in Germantown, Maryland. This item can be shipped to United States.