Housing made of solid aluminum, hand-finished structural surface, color: black anodized aluminum, TFT display screen diagonal 14.2cm (5.6 inches), color resolution: 640 x 480 pixels, surface mounting, hands-free, blue door opener button, text message reception, convenience functions (internal call, doormatic, call forwarding, switching functions), selection of 13 ring tones, adjustable via OSD, based on the TCS video system in 6-wire technology, power supply: 26V +/- 8%, input current: I (a) = 0.4 mA, I (P) = 25 mA at rest, maximum input current: I (Pmax) = 300 mA, permissible ambient temperature: 0 degrees C to 40 degrees C, tested according to EN 50486, housing dimensions: H 190 mm x W 150 mm x D 20 mm