Easy to Install and Carry: Cylindrical shape electret microphone PCB with through hole design for easy installation. Small and lightweight, easy to carry. Feature: An electret microphone is a type of electrostatic capacitor-based microphone, which eliminates the need for a polarizing power supply by using a permanently charged material. Application: Electret condenser mic enable communication and recording in devices including telephones, smartphones, desktop computers, headsets, recording systems and more. Specifications: Sensitivity: 85DB; Size: 10 x 7mm/0.4" x 0.27" (Dia.*H); Type: with Pins Type; Pin Quantity: 2; Pin Length: 9mm/0.35"; Package Content: 8 x Electret Microphone. Clear Audio Quality: Electret condenser microphone with high sensitivity and low noise for clear audio recording. Perfect for PCB DIY audio projects and professional audio equipment.