... door phone and video intercom for 6 years, we are marketing:1, 4 wire CX and NCX system for villa and multi ... ; 2, 2 wire TW system for villa and multi-appartment; 3, PBX system for multi-appartment; 4, Wireless system;7435 CX/NCX_C35+7162 ... CX descriptionFuction:1, Audio/video communication, 7'' TFT LCD color display;2, Intercom, inspection and ...