If you're the sort of person who's always losing their keys, Sticknfind may be your solution. The project, which has currently passed its Indiegogo funding goal by over 900 percent, pairs an iPhone or Android app with 4.1mm-thin "location stickers" that work with Bluetooth 4.0 and can attach to almost anything. The idea is that you'll be able to track any object within a range of 100 feet — battery life is said to be around a year.
Through the app you can see how far away the sticker is and make it buzz or beep remotely. You can also set it up to send phone notifications when the sticker goes within or outside a certain range. The app's design is pretty slapdash, but seemed to work well enough; pings happened quickly, and the radar-style screen updated itself regularly. Sticknfind will ship next month — you'll get two stickers for $49.99.