Extra Low Noise "Silent" Air Compressors QD820 QD320 Price: $288.00 out stock Price: $245.00 out stock These are air compressors with extra low noise. QD820: 185W,0.6-0.8Mpa,4L tank,0.02m³/min, 45dB, 420x190x440mm, 45 pounds, stainless portable case. QD320: 185W,0.6-0.8Mpa,1.2L tank, 0.02m³/min, 45dB, 420x190x320mm, 40 pounds, stainless portable case.