無む指し向こう性せい

noun which may take the genitive case particle 'no'

omnidirectional; nondirectional

Technical term used mainly for microphones, antennas, and similar devices that pick up or radiate equally in all directions.

• このマイクは無む指し向こう性せいなので、周しゅう囲いの音おとを均きん等とうに拾ひろいます。

  This microphone is omnidirectional, so it picks up surrounding sounds evenly.