Okay wait, rarely some off fireign brand is used...they are on a different frequency, regulation on this issue failed in 2009, but really this is rare and only when a company choosen to use an alternative frequency which was intended to get vets to by their specific scanner.
We use homeagain, it reads all chips on the former us frequency...most pounds and shelters use homeagain abd any chip can be converted to them.
I prefer homeagain, they donate scanners to pounds and shelters, and have dropped the price when no other company would |