Presumably each of those gizmo's must have a cell phone account?
No, when you remove the battery isolator strip of plastic, you simply put it by your phone which then asks you to open the "find my p hone" app and registers it. For a test I stuck one in the family pool car which immediately got borrowed and I could see exactly where it had been taken. It also alerted me that the car had left home.
Appreciate I certainly never want my bike nicked, likewise that a committed crim is still going to nick it whatever you do. However on first impression this appears to be a useful option, doesnt need wiring in, claims a decent battery life and was able to put it somewhere I thought was obsure on the bike and would not immediately be found. I bought a pack of 4 and will put them with various vehicles attached with a bit of Duct tape which I could tear off each year.
Strikes me as useful , they sell them with key fobs so you can find your keys. Could even be in your own bag in case you left it somewhere.
Sadly bikes are often stolen and broken up and this isnt going to identify any parts on your bike like microdots do and by the time its stripped down one of these buttons is going to have been found no doubt. But hopefully gives a fighting chance of beating that happening.
If you're familiar with the find my p hone app the discoverability is the same