1. and high-quality products.<br> 2. Made of high-quality materials, and practical.<br> 3. Fine workmanship and good performance.<br> 4. Long service life.<br> 5. A special amplifier board for electret microphones powered by 48V phantom power, universal and single-point electret microphones.<br> By matching the microphone with different parameters, it can be used for karaoke, recording, conference speech and so on.<br> 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.<br> Type of microphone used:electret microphone<br> Frequency response and sensitivity:(depending on the use of microphone)<br> Output impedance:250 ohms<br> Sound pressure level:125db<br> Signal to noise ratio:60db<br> Power supply:15-48v phantom power<br> Working current:about 3.2ma<br> Board size:45mmx15.82mm (cannon head part is not included)<br> Colour:Black<br> Material:PC+Metal<br> Package Contents:<br> 1 * Microphone amplifier board<br> Only the above package content, other products are not included.<br> 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.