The Yealink W70B is a base station and does not include any handsets. This is a replacement part that can be ordered if your existing Yealink base station is damaged.
It is compatible with the following Yealink handsets: W53H, W56H, W57R, W59R, W73H, W78H.
It is NOT compatible with the Yealink W52H handset (sold between 2016 and 2019).