i can only speak of this one! yes, our cat has already picked it up twice, once a neighbour found it, the second case is still unsuccessful somewhere in the bushes, so the exact search with bluethoot approach does not work correctly, you can stand on the spot where it should be, but there is nothing! battery times are not bad, but the tracking (course) could be better! don't know that our cat is such a good swimmer, already crossed the vierwaldstättersee several times! well!