![]()  | 
| 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 |