1, 4 IN 1 : Check USB coaxial cable, telephone line, Type 5, 5e and 6 twisted cord network and trouble. 2, Scanning locating Network cable, Telephone line, coaxial cable. 3, Use TDR (time domain reflectometer ) ,  Measure length and distance, find the trouble location.  4, Find the determine open circuit, short circuit, jumper of crossfire.  5, Service line test and no external adaptor is required. 6,  Check cable sequence. 7, Determine continuity and wiring pattern. 8, Low battery display. LCD display size: 4.5x3cm
----power supply supply 9v-battery(not incl)