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| 1.Special import preamplifier IC | 
| 2.M11 dynamic levels to enlarge | 
| 3.Very low noise distortion | 
| 4.Regulator circuit | 
| 1.Area:10~50m² (adjustable) | 
| 2.Audio transmission distance:100m | 
| 3.Sensitivity:-55dB±3dB | 
| 4.Impedance:600Ω | 
| 5.Signal amplitude:0~6Vp-p | 
| 6.Frequency range:100Hz~15KHz | 
| 7.Power supply:DC6V~12V 20mA | 
| 8.Wire length:95mm | 
| 9.Dimension::Φ6*16mmmm |