Factory Seconds : Karaoke Mixer : Dual Microphone, Stereo Music, Stereo Output, Balanced Note these are factory seconds, some units may have one or both line inputs not working. Get quality controlled version from here : https://www.amazon.com/Karaoke-Mixer-Microphone-Stereo-Balanced/dp/B01H66TT52 Full metal case. Runs for more then a week on a 9v battery (battery clip provided), or use wall AC/DC adapter (DC 9 to 20v, 2.1 mm positive tip) 2 balanced microphone inputs (can amplify instruments as well - balanced or unbalanced lines) stereo RCA input - play from your iphone, android, table, computer, cd player, etc. stereo RCA output.