CAD 631L Astatic Noise Cancelling Dynamic Palmheld MicrophoneAstatic 631L Overview The Astatic 631L Handheld Microphone features 360 degrees of background noise cancelling, making it an ideal microphone for high noise environments such as factories, airports, restaurants, construction sites and more. A thumb switch provides quick momentary On Off function and a four conductor unterminated cable connects to paging systems, radio receivers, etc. The omnidirectional polar patter provides a generous pickup area and
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