静せい音おん

noun, noun which may take the genitive case particle 'no'

low noise; silent operation

Used for machines, appliances, or devices that operate quietly or with minimal noise. Often appears in product descriptions.

• この掃そう除じ機きは静せい音おん設せっ計けいです。

  This vacuum cleaner has a low-noise design.

• 静せい音おんモードに切きり替かえると、動どう作さ音おんがかなり小ちいさくなる。

  Switching to silent mode makes the operating noise considerably quieter.