About the size of a coin, the Button TrackR attaches to almost anything. Along with the accompanying app, it will notify you of when you have left an important item behind. The app also remembers the time and location you separated from said item, and can keep track of up to 10 items simultaneously. Perfect for those of us who have the tendency to lose up to 10 items simultaneously. Button TrackR has recently launched a funding campaign, and you can help fund it over at Indiegogo.