Yealink W73P User Guide
The W73P is a single cell DECT device from Yealink. The W73P has two components, the W70B base station and the W73H handset. You can purchase additional W73H handsets separately, though one comes in the W73P package.
The W73P will allow you to register up to 10 users using the W73H handset per W70B base station. When using a RT30 Repeater, it also supports "Cascade mode" as well as "Star Mode". For full details on these modes, please see the Yealink DECT Repeater RT30 guide.
Before you use your phone, you should take some time to get familiar with its features and user interface.