Low quality product (the faux-leather cover any chipped arrived, as if she had already served while she was obviously new), and as announced in other opinions, the ON / OFF button is reversed. But if not, the product makes the job very well, namely test each wire of the RJ45 socket. I used it to check the RJ45 wiring a new apartment, and it does the job very well. For the price, low quality will be forgiven, right?