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 Features:
| 1.Low-noise processing chips | 
| 2.Special explosion-proof metal | 
| 3.Power polarity protection circuit | 
| 4.DC Plug+RCA +DC Jack | 
 Specifications:
| 1.Area:10~120m² (adjustable) | 
| 2.Audio transmission distance: 1000m | 
| 3.Sensitivity:-46dB | 
| 4.Impedance:600Ω | 
| 5.Signal amplitude: 0 ~ 6 Vp-p | 
| 6.Power supply:DC6V~12V 20mA | 
| 7.Dimension:39*31*18mm | 
| 8.Wire length:400mm |