If all three LEDs are on with a green color, then the cable and its connectors are good and the phantom power is good (of course, if you have the SENDER at the other end, then you are testing only the cable, not the phantom power)

Besides the all-green LED status ("All green, cable is clean"), the other eight patterns will make no sense without the included chart

They intended a small, sturdy and inexpensive cable tester and that is what they produced

Has gotten me out of some jams and prevented me from running bad combo cable on truss in the air.