Now this is something that has been around for a while, but it is a little bit more intuitive and simple. The loc8tor lite is the best product to find lost items, what ever they may be. You have two tags that come with it and you can add two more for a total of four, you can attach it to car or your phone. The device itself has different beep levels to help you go in the right direction and it works up to 122 meters away, and it would get you to within 2.5 cm of the objects. You have two ways to attach it, using an adhesive or strap, the only issue is that the tags are the size of candy which I assume is the reason for its operational distance.

Price: $75

Link: Loc8tor