It took me a while to figure out how it works.  The button at the bottom should be larger so one does not need an object like an ink pen to push it.  I kept fooling with it until  I figured it out and was glad I didn't just pitch it.  If this is what TSA wants us to use, it is a good one.  A different one came with luggage I bought and that one I could not set.  It could not be figured out and broke.  So this is useable.