LinkMejor 10pcs Electret Condenser MIC 4mm x 2mm for PC Phone MP3 MP4

Electret condenser microphone, back electret type, small in size, in general use.An acoustic-to-electric transducer or a sensor that converts sound into an electrical signal.Widely applied to telephone, mobile phone, MP3, MP4, laptop, digital camera, intercom, monitor, etc.