The CALIFORNIA AIR TOOLS 4610AC Ultra Quiet & Oil-Free Air Compressor is designed to be one of the quietest air compressors in the industry having only 60 decibels of sound. The powerful 1.0 HP (SP-9413) motor operates at only 1680 RPM creating less noise and less wear. The “New” SP Series of Ultra Quiet Air Compressor Motors have been designed to increase duty cycle and allow for longer continuous run times. The Oil-Free Dual Piston Pump System is engineered for high performance and durability. The CAT-4610AC Air Compressor has a Oil-Free Dual Piston pump designed to have a life cycle before wear of 3000 Plus hours compared to other comparable air compressors with life cycles of 500 hours or less. The Oil-Free pump allows for use in a variety of temperatures and uneven terrains. The 4.6 Gallon Aluminum (Rust-Free) Air Tank is Lightweight (45.5 lbs) and very easy to transport. This air compressor is ideal for anyone working inside where noise is a major issue.