Useful as a cat locator but does not work on our cat for stated purpose.
Unfortunately this collar has had no effect on stopping our cat catching birds. The sound alarm seems to go off at random intervals, even when our cat is asleep. What it is useful for, which is why we are still using it and I might have bought for this alternative purpose anyway, is as a cat locator. We like to bring our cat in to the house when we go out which means finding her first. The collar is a useful aid in doing that through the sounds it emits which does not seem to bother her at all nor us as it is at a volume and tone to hear without ever becoming irritating. Great shame about the birdlife though.