- Panasonic 8 port digital expansion card (DLC8)- Adds capacity for up to eight digital ports, which can support KX-T7600, KX-T7400, KX-DT300 and KX-T7200 series phones, DSS, KX-T0151 and KX-T0155 cell station and voice mail- Maximum of two per system- To support Bluetooth with the KX-DT300 requires v.5 software versionKXTDA5172