Bt 4000 additional handset for existing system with charging cradleitem cannot be used without base stationbase station not included brand new item with full warranty in plain packinghandset will need to be manually registered to the main base upon arrival please refer to manual for the main phone the bt4000 additional handset is a new easy to use handset incorporating the easy to use features that you have come to expect from bt productsv designed in the uk the bt4000 big