A:AnswerProbably not 100 feet but it will give you a general idea of where the item was last seen/read from so you have a clue. I find that it works very well with the newer iphones with precise location.
A:AnswerYou can use AirTags on remotes, other keys, and not sure about keypads. Are you referring to the keyboard of a computer? Yes, you can transfer your singular AirTag to almost any item, but check to see if a specific case/cover/ holder is made for your specific item. Like Apple has a wallet case about the size of a credit card to hold the AirTag.
A:AnswerThe loop is well a loop. If the object will allow you to place a loop around it then it can be attached. If you can't use a loop then know the loop won't magically allow you to attach the device to anything. Honestly baffled trying to answer this because it seems like a really straightforward concept.