Zoostliss Network Cable Tester RJ45 RJ11 RJ12 UTP LAN Cable Tester Networking Tool

does this test each line individually & sequentially? I have rj45 preinstalled in wall, i am trying to determine if there are crossed or open lines?

Does this work with cat 6 cable? i purchased one and i can't get it to light all 8 for cat 6, even when i visually verify that the pin-out is correct.

Is there a maximum length of cable this will work on?

Testing Cat6 cable. One end is plug and other end is wall outlet. Do I need to use crossover cable to have lights blink in order?