For connecting external doorbell buttons for up to 32 residential units via a 4 x 8 button matrix. Operation with the TCS:BUS speaking module AMI11110-0010 /-0057 via a 4-pin connector, allowing the connection of up to 8 built-in doorbell button extensions, corresponding to 256 external doorbell buttons. Operation with the IP built-in door speaker ASI91000-0000 via a 4-pin connector, allowing the connection of up to 8 built-in doorbell button extensions, corresponding to 260 external doorbell buttons. Suitable for indoor use and protected outdoor areas. Can be integrated behind external front panels. When operating with the TCS:BUS speaking module AMI11110-0010 /-0057, the functions of sending door calls, controlling lights, sending a control function, or sending a door opener command for external doorbell buttons can be configured. Each external doorbell button can be assigned to 2 indoor stations. Configuration with configoTM. When operating with the IP built-in door speaker ASI91000-0000, one SIP call per external doorbell button or alternatively the control of external actuators can be configured. The settings are stored in the EEPROM of the respective central module. Optical and acoustic error messages are provided by the connected central module. Attention! This item is not yet approved. The provided data is for quotation purposes only and may change without notice until the product is approved. Allowed ambient temperature: -25 degrees C to 55 degrees C. Weight 60 g. Dimensions: H 56 mm x W 88 mm x D 30 mm.