For those of us who need to keep a tab on pretty much everything, the StickNFind Bluetooth Stickers ($50 USD) would do the trick. Packed into a quarter-like sticker is powerful Bluetooth technology which allows for the tracking of your desired item via your smartphone. If you lost something, simply tap the desired circle on your smartphone and you can enable the sticker to flash its lights, buzz, or do both. Another great feature is its Virtual Leash function which allows you to tell when your item is within range. Therefore, you are alerted when your item moved or is around you. Be sure to stick it onto things that you lose quite easily around the home like your car keys, passport or even wallet.