Panasonic Cloud Business Phone System, KX-TGP551T04, Black, 1 Handset (VoIP/ SIP) It features DECT 6.0 Technology with auto attendant and mobile phone integration It has corded Base and one cordless handset It has customizable up to 3 direct lines serving up to 8 unique phone numbers (with fax option) It is expandable up to 6 cordless handsets It requires phone activation and monthly service subscription on PanasonicCloud after phone hardware purchase