Hello, I'am trying to use the simple can directly to a FMB640. The problem is that the simple can led doesn't blink. I press the button but nothing happens, and I already tried two. This devices are quite old , around november 2017, and I never used them, I had som All-Cans and LV-cans from that order that didn't work also.
Can it be that the simple cans won't work because of the age? It seems strange due to the work they do.
I would really appreciate any help