AMUMU GLORIFIER acoustic preamp direct box is fully handcrafted with very low noise, excellent clarity and warm EQ. It is designed for all acoustic-electric instruments with various pickups. Its built with +/-20 dB Gain control and 3-band EQ, powered by either 9V DC adapter(center negative), 48V phantom power or the 9-volt battery, connected with 1/4/4/4 volt battery. " Unbalanced Input. , XLR Balanced Output and 1/4" Unbalanced Output.