W80B ; IP DECT multi-cell base station ; DECT technology ; seamless handover and roaming ; up to 8 WB calls (4 active handsets) per base ; up to 8 NB calls per base ; 50 m indoors/300 m outdoors ; compatible with Yealink W56H/W53H/ CP930W/T41S+DD10K ;without power supply ;To be used with SKU #YKW80DM (mandatory), PoE required, AC optional, SKU #YKPSU1. TECHNICAL NOTE: The YKW80B base station requires firmware version 103.83.0.70.rom or later in order to pair and operate with the W80DM base station in a multi-cell environment.