5-40m²,DC 12V,impedance:600~1000 Ohm nonequilibrium,SNR:50dB(40 dB for 1m),size 39mm*31mm*18mm,DC12V(red),RCA(white),sensitivity adjustment. 
Adjustable Sensitivity Wide Range Spy Covert Microphone Mic for CCTV Camera DVR
Audio Pick Up Device Camera DVR System High Sensitivity Microphone

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