Isolation Transformer Eliminates Noise Very low harmonic and phase distortion Compact and robust design for live sound and studios. Isolated XLR connector eliminates chassis ground potential Custom audio on the inputs provide isolation to noise and noise-induced ground loops while maintaining signal integrity. PC board with full ground plane for reduced susceptibility to noise High quality switches - , high cycle times and reliable performance 14-gauge steel welded I-beam construction makes twisting of the PC board nearly impossible The -15dB pad can reduce the level of loud sources that can overload the circuit and cause distortion Bookend design creates a protected zone around the switch and connector, indestructible 14-gauge steel construction Full non-slip rubber bottom pad provides mechanical isolation, electrical insulation and prevents the unit from sliding Balanced XLR XLR output interface, standard with 1-pin pin and 2-pin pin The elevator switch raises the ground to pin-1 on both channels. Heavy-duty baked-on enamel finish for exceptional durability Colour:black Material:Metal Size: 12 x 7.5 x 4cm Package Contents: 2 x DI Box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.