Appearance patent, surface shell with a new manufacturing process IMD International, satin decorative, colorful dazzling Anti-impact, 2H surface hardness, scratch, anti-UV, eventually becoming oxidized years, do not fade Keyboard waterproof, dustproof night vision LED backlight, high sensitive touch buttons The system automatically retrieves dynamic fault function, household extension of communication cable, video power line Video signal line short-circuit protection are automatically isolated, host bus short circuit protection will be de-energized Host built-in voice broadcast circuit, voice guided operation, voice prompts fault function HD camera video intercom, call ext visitors, help unlock intercom call management center Digital host has one yard per household, arbitrarily set, change the password lock function independently In response to customer demand, configurable IC / ID card access lock or unlock function wireless remote control Staircase light control functions can be added, and the indoor extension ladder consisting of a light control system RJ45 network has seat and seat row of pins to support two kinds of pure RVV cable and wiring Call indication, the concept of humanity