Our video intercom has several variations on this basic format. In addition to outdoor panels with one pushbutton per apartment, also a numeric keypad on the video outdoor panel is possible: it is designed for large residential installations, the homes are identified by codes. Visitors can contact the owner through the numeric keypad in this case. Others have built-in cardholders panels or even small screens to guide the user or facilitate entry for people with disabilities. Some video entry monitors have an earpiece similar to a telephone handset, while others are “hands-free”. Other examples are monitors with memories which store an image every time someone calls at the door or touchscreen video entry systems.