Material: The compact design of the aluminium seal optimizes sound accuracy and ensures a long service life. Pros: The electret microphone is an electrostatically capacitor-based microphone that eliminates the need for polarized power by using permanently charged materials. Model: 6050P; Working voltage: 2V DC; SENSITIVITY: 48-65DB; Size: 6 x 5mm, Type: Type with pin; Number of pins: 2; pin length: 10 mm / 0.39 inches. Package includes: 20PCS electret condenser microphones Application: Electret condenser microphones support communication and recording of telephones, smartphones, desktop computers, headphones, recording systems and other devices.