
I know about wireless door bell/video door bell..
Video intercom system is a modern well-off residential service measures to provide visitors and residents between the two-way video calls, to image, voice recognition in order to increase both safety and reliability, while saving a lot of time and improve efficiency.
More importantly, once the door magnet installed inside the home at the beginning, infrared alarm detector, smoke adventure sensors, gas alarm equipment connected to the security video intercom system, since on the indoor unit type, video intercom system Upgrade to a Security and Protection Network, which can and residential property management center or residential security wired or wireless communications to play a security, disaster preparedness, prevention and other safety protective effect of gas leakage for the life and property owners to provide maximum degree of protection