Heritage Audio Baby RAM, Passive Desktop Monitor Controller, 24-Position rotary switch with 0.1 dB for each individual attenuation level, Mono / DIM / Mute button, 4 Line outputs: 6.3 mm jack balanced, 4 Line outputs: 6.3 mm jack balanced, Does not require a power supply, Dimensions (W × H × D): 180 × 58 × 250mm