Busch-Welcome is a high-end door communication system offering solutions for many situations thanks to its holistic concept. This is made possible by the 2-wire bus technique. Despite its compact form, it offers a wide range of functions. When a visitor activates the intercom, a photo can be taken and stored. The easy access keys open the door, mute the sound and control the corridor light. A particularly useful feature for the hearing impaired is inductive coupling to hearing aids.