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 is ideal for busy commercial use. Its rugged, black housing is ideal for rigorous use and the frequency response is tailored for speech. The 631L also features a soft lip-guard for close capturing.