Product Name: Electret Condenser miniphone; Each Size: 4 x 2 mm / 0.16" x 0.078" (D*H) Total Length: 20mm/0.78" Main Color: Silver Tone, Black, Green Material: Plastic Electret 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 Contents: 10pcs x Electret Condenser miniphone Only 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.