I found something interesting; I thought you guys may like to see the the duty cycle, so I grabbed my wallet DT Diagnostic card, I put it on the reader, and No LF LED !!! So I thought, it must have broken in my wallet.
I had 2 other unused 
I tried them, they didn’t work either…weird because it’s still reading my LF implants
I grabbed another field detector…this one worked.
So if you were still wondering, it appears to be an almost constant but very rapid duty cycle