Yealink W80b Multi-Cell Dect Base Station (YEA-W80B) - Roaming/Handover: Seamless Handover and Roaming, Total Handsets; Up To 100 Handsets, Max. 8 Handsets Per Base Station, Simultaneous Voice Calls: Up To 8 Simultaneous Calls Per Base Station, Range: 50m Indoor/ 300m Outdoor, Compatibility: Yealink W53H, W56H, W59R Handsets, DECT Desktop Phone And CP930W Conference Phone