It is well made with high-quality copper and uses Techniques such as frosting and spraying with high precision.It has a decent appearance and simple and solid structure. Well-designed acoustics cavity makes the sound head?sfrequency responding range extend. As a result, the low frequency is full-bodied and deep while the high frequency clear and penetrating.Its inside acoustic circuit and wiring have been designed and made carefully thus has little noise and low distortion.It especially can be used in stage presentation, press conference, broadcasting and recording, large reports and meetings.Its base is founded with a solid stamper with vibration-resisting and isolating robber. So it can stabilize the microphone and reduce vibration noises. It also has a windshield to reduce surrounding noises and prevent wind.It has strictly examined by acoustics tests and its frequency responding, directivity and sensitivity agree with each other. MK818 can be used as a stereo microphone. >>>Technical specifications: Frequency range:20-20000 Hz Sensitivity: - 34 dB (20mV/Pa) Directivity: Supercardioid Pickup angle : 120° Maximum SPL: 138 dB Output Impedance:150Ω Power requirement: 48V Signal to noise ratio: ≥78 dB >>>Usage method and proceedings with attention： Install the mike when use it ,and adjust the voice collecting angle to a proper position. Keep a distance over 10 centimeters while talking to ensure the voice effect . >>>The mike will be repaired freely for life.