ART Macro Mix, 4-Channel to 1 Mono Mixer, Signal To Noise Ratio : >90dB, max. Gain : +40dB, Input Impedance: 10K 10K ohms unbalanced (all inputs), 4 Line-Input unbalanced, Headphone-/Line-Out, 12V DC Power Supply included, Dimensions : 143mm x 92mm x 45mm, Weight : 725g