Product features: Function module of the AMI series, Number of bell buttons: 4, Mounting type: flush-mounted, Material / color: aluminum, anodized silver, Connection to display module / built-in, door loudspeaker module: 4-pin service socket, Connection of additional bell button module:, 4-pin service socket, Opening principle: win:clip, Advanced functions: Light switching function: programmable, Switching function: programmable, Door call function: programmable, Programming mode / error display:, Various flashing modes, Energy-saving LED nameplate lighting, Number of wires: 3-wire required, Technical data: Technology: 2-wire TCS:BUS, Current consumption, at rest: 4.5 mA, Clear dimensions HxW mm: 82x82, External dimensions HxWxD mm: 105x105x20, Nameplate HxW mm: 66x49, Permissible ambient temperature: -25 to +55 degrees C, Protection class: IP44