Connection standard: DECT (digital); Package contents: tube base ; Radius of action indoors: 50 ;m; Radius of action on the ground: 300 ;m; Functions/capabilities: The answering machine / only v model M555 / Intercom (internal link) Loud link (speakerphone) ; Supported handsets (base): 4 ;pc; Supported databases (tube): 1 ;pc; Phonebook: 100 ;rooms; Polyphonic ringtones: +; Ringtones: 10 ;pc; Memory included: 20 ;rooms; Memory outgoing: 50 ;rooms; The display on the handset: monochrome; Display backlight: +; The time in standby mode: 250 ;h; The time in conversation mode: 16 ;h; Search tube: +; ...