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| 1.Pinhole in the acoustic pillar | 
| 2.High sensitivity | 
| 3.Power polarity protection circuit | 
| 1.Area:50~100m² (adjustable) | 
| 2.Audio transmission distance:100m | 
| 3.Sensitivity:-60dB±3dB | 
| 4.Impedance:600Ω | 
| 5.Signal amplitude:0~5Vp-p | 
| 6.Frequency range:100Hz~15KHz | 
| 7.Power supply:DC9V~12V 20mA | 
| 8.Wire length:70mm | 
| 9.Dimension:Ø13*50mm |