Cheap phone made in china for building intercom audio system PY-DP3207

Specifications 1.Anti-oxidation, wearable aluminum outdoor unit.

2.Talking distance is above 100m (2X0.75mm2).

  Cheap phone made in china for building intercom audio system PY-DP3207   1.   2-wire connection.  
2.   With unlocking function.  
3.   Anti-oxidation, wearable aluminum outdoor unit.  
4.   The name or room No. of the user can be displayed  
5.   on the outdoor unit , along with LED indication.  
6.   High-quality circuit to promise sharp clear voice.  
7.   Talking distance is above 100m (2X0.75mm2).  
8.   Easy DIY installation.     audio door phone show as follow:     classical  audio door phone