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| 1.Built-in AGC circuit audio gain |
| 2.Metal mesh into the audio port |
| 3.Japan made gold capacitor microphone |
| 4.Dynamic closed-loop noise reduction circuit |
| 1.Area:10~100m² (adjustable) |
| 2.Audio transmission distance:1000m |
| 3.Sensitivity:-46dB±3dB |
| 4.Impedance:600Ω |
| 5.Signal amplitude:0~6Vp-p |
| 6.Frequency range:100Hz~15KHz |
| 7.Power supply:DC9V~12V 25mA |
| 8.Wire length:120mm |
| 9.Dimension:86*86*34mm |