Durable design, working well even in construction location. ??Cable Tester for RJ11, RJ45, 10/100 Base-T and telephone cable, etc ??Automatic efficient scan for the miss wiring, disorder cable, open and short circuit. ??Test of the RJ45 RJ11 Cat-5 Cat-6 cable. ??If all the cables work, the lights will become green from NO.1 & 2 to NO.7 & 8 sequently. ??If any light is not on or turns on unsequently, the cables are broken. ??Automatically scan mode, rapidly testing, the streamline shape is in accordance with the design of somatology.