Your PC will show 8 characters whether you set four-character long password or a 20-character long one. Should you ever try to crack a password using the brute force method
one detail you're required to know is the password length.
so, they hide it, of course
As for the device, try to change the type of encryption (like WEP to WPA (or WPA2).. see if that sorts things out. I don't know if this can help, but I had the same problem with my PSP once, and solved it that way. It was the type of encryption key.