Welcome to our store！</br>1、Wide application ranges. Suitable for Public inspection law interrogation room, prison, finance, education (5 ‑ 100㎡ adjustable). 2、High sensitivity, low noise, very low power consumption, power supply polarity protection circuit. 3、Signal transmission distance is approx. 1000m/1093.6yd. Frequency response is 20Hz ‑ 20kHz. 4、Connection method is 3‑wire system. Red is connected to power positive pole, black is connected to public GND, white is connected to audio positive pole. 5、An electro‑acoustic instrument that amplifies sound by receiving sound vibrations. <div class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text"> Item Type: CCTV&nbsp;Microphone Material: ABS Use place and area: Public inspection law interrogation room, prison, finance, education (5 - 100㎡ adjustable) Signal Transmission Distance: Approx.1000m/1093.6yd Frequency Response: 20Hz - 20KHz Pointing Feature: Full pointing Output Signal Amplitude: 2.5VPP / -25dB Connection Mode: 3 Wire system(Red is connected to power positive pole, black is connected to public GND, white is connected to audio positive pole) Transmission Cable: RVVP3 x 1.5mm² Power Supply Voltage: DC 12V <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> </div> 1 x&nbsp;CCTV&nbsp;Microphone1 x&nbsp;English Manual Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>