Video Door Phones

Confidential conversation Conversation and calling among extensions is available. Noctilucent Keyboard. Can connect 100 hosts and can cross floors, each host drives at most 64 extensions. The connection of extension is 2-nonpolar line. Short connection of any extension does not effect the whole system. Extension number can be set up directly on the Keyboard. Two individual unlocking passwords are available for each household; password can be altered at keyboard.