Rear jack with square wave output jack and USB communication port, this unit is also equipped with a 5V adapter TFT color display HD display, with character function display, large screen color display, at a glance Panel buttons, soft buttons, feel comfortable, easy to press the multi-function combination button With product support frame, there is a retractable support frame, which is supported on the table top Widely used in electric power, communications, meteorology, railways, oil fields, construction, measurement, scientific research and teaching units, industrial and mining enterprises and other fields