... or house directly. And we offer good after-sales service. Hardware featuresUSB port fit for USB 1.1 standard; The input ... unit extension, simulated telephone line derivative by ISDN.Quality AssuranceHardware 3 years replaces, 5 years warranty, software life long free upgrade ... phone number, call number, talk time and content etc. 3.In step with telephone operation, timely recording, store in hard ...