1. 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 microphone Frequency response and sensitivity:(depending on the use of microphone) Output impedance:250 ohms Sound pressure level:125db Signal to noise ratio:60db Power supply:15-48v phantom power Working current:about 3.2ma Board size:45mmx15.82mm (cannon head part is not included) Colour:Black Material: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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!