Lot of  4 steren 250-720  XLR Female Jack 3 pin Microphone Audio Cable Connector

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3 Pin XLR Female Metal Microphone Connector with Strain Relief 

XLR connectors are used in custom "pro" audio hookups to connect microphones to PA amplifiers, mixers or extension cords. These hookups are balanced, which helps cut out noise and hum pickup. A balanced line consists of three paths of current flow, using a cable consisting of a pair of twisted wires with a shield covering them. The twisted pair would carry the actual audio signal while the overall shield acts as a noise absorbing barrier. The shield is typically connected to ground.