Advantage:

• Voice Intercom: People inside door can talk to visitor and open door remotely;
• Doorbell function: Bell button with light, waterproof design;
• Door Control: Relay to door lock, can open door lock with any telephone inside once door phone connect to PBX;
• Directly call to present extension;
• Web management;
• Can be powered by PoE or adapter;
  
• Fully waterproof performance( a waterproof testing video at following link for your reference)
  

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• Hard metal case: Aluminium alloy case