... Dispatch system recording in electricity, railway and civil aviation, then the obligation will be very clear; Office recording for leaders in ... automatically, easy to check, e.g.,if the date is Mar. 21, 2012, then the file name will be 20120321.Build-in function ... Hardware featuresUSB port fit for USB 1.1 standard; The input line is suitable for exterior local calls, interior unit extension, simulated ...