Mackie MDB-1A, Active Stereo Direct Box, Suitable for stereo sources such as keyboards, media players, etc., High impedance 6.3 mm jack input with thru output and 20 db pad, Balanced XLR output with ground lift, low cut and polarity switch, Merge switch, 48 V phantom power supply, Dimensions: 36 x 86 x 147 mm, Weight: 400 g