A:AnswerAs long as the Tile is within range then you should be able to track the tile on your Kitten. Per their product page description, the Pro has 300ft range, the Mate has 150ft range and the slim has 100ft range.
A:AnswerThe Tile has to be in range of your Bluetooth. It won't track a car unless you get close enough driving around with your phone for it to show up, which is hard if your car got jacked. It can tell you WHEN it got stolen. It will tell you the last time it was in range.
You don't need one on your phone. If you have one in your wallet or on your keys, you can press the button on your tile and your phone will ring (it also rings when your phone is in silent or do not disturb mode). So, you can only lose one thing at a time. I bought the four pack and I set up one to just hang on a hook by the back door. This way if I lose everything I can at least find my phone which I can then find everything else.