1. 100% brand new and high-quality products.2. Made of high-quality materials, durable and practical.3. Fine workmanship and good performance.4. Long service life.5. A special amplifier board for electret microphones powered by 48V phantom power, universal and single-point electret microphones. By matching the microphone with different parameters, it can be used for karaoke, recording, conference speech and so on.The bottom noise of the amplifier board has a lot to do with the microphone. It is recommended to use a low-noise electret microphone to achieve the desired effect.Type of microphone used:electret microphoneFrequency response and sensitivity:(depending on the use of microphone)Output impedance:250 ohmsSound pressure level:125dbSignal to noise ratio:60dbPower supply:15-48v phantom powerWorking current:about 3.2maBoard size:45mmx15.82mm (cannon head part is not included)Colour:BlackMaterial:PC+Metal Package Contents:1 * Microphone amplifier board Only the above package content, other products are not included.Note: Light reflection 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.