W90B ; 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 ; external antennas ; 50 m indoors/300 m outdoors ; compatible with Yealink W56H. /W53H/W59R/CP930W/T41S+DD10K ;without power supply ; to be used with SKU #YKW90DM (mandatory), PoE required, AC optional, SKU #YKPSU1.