Yealink DECT IP Multi-Cell base station with external antennas Can be expanded to a multi-cell IP DECT system with the optional W90DM DECT Manager and additional, optional W90B base stations. Yealink HD voice quality, supports up to 8 simultaneous calls, Power supply via PoE (Power over Ethernet, IEEE 802.3af, class 1), compatible with Yealink W53H, W56H and W59R DECT handsets as well as the Yealink CP930W DECT conference phone