![](http://rktechnologies.in/assets/uploads/media-uploader/blue-e-learning-platform-announcement-offer-education-facebook-post-21627646100.png)
An intercom (intercommunication gadget), talkback or door phone is a stand-alone voice communications system for use inside a building or little gathering of structures, working autonomously of the general population phone arrange.
An intercom system is a two-way correspondence electronic gadget that contains hardware to transmit and accepting sound as well as video transmissions.