| Standard door telephone : surface-mount / stand-alone (desktop accessory) : duplex communication : choice of 6 ring tones : ring tone volume / manually adjustable : ring tone mute with optical display : optical display of the short-term memory for front-door calls : optical display of a busy line : casing made of antistatic and recyclable plastic : blue-colored door release button : acoustic call distinction for front-door, flat-door and internal call : ring tone volume / manually adjustable : ring tone mute with optical display : optical display of the short-term memory for front-door calls : optical display of a busy line : audio privacy function and automatic call cut-off : audio and video in-house stations can be combined within one system : color: pure white : 2-wire technique : 3-wire technique possible : operating temperature range: 0°C to 40°C : dimensions: H 212 mm x W 94 mm x D 62 mm |