FERMAX doorphone kits include all the necessary material for installation in a single-family home or office. The Citymax Audio Door Entry system kit includes: For the interior of the house, the Citymax telephone with wall installation and easy fixation. Made of high impact ABS plastic with a mirror polish finish for easy cleaning. For the exterior, the City Classic door panel , with a genuinely urban character, of great resistance and quality. Made of anodized aluminum with great resistance to weathering and climatic changes.