Product Name : Electret Condenser miniphone;Each Size : 4 x 2 mm / 0.16 inch x 0.078 inch (D x H)Total Length : 20mm/0.78 inchMain Color : Silver Tone, Black, GreenMaterial: PlasticElectret condenser miniphone, 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.Package Content : 30pcs x Electret Condenser miniphoneOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.