Absolutely nothing to do with cards, but - you need these:
Pebblebee Stone: Item Tracker & Smart Button now funding (funded) on Indiegogo. This incredibly small BTLE (BlueTooth Low Energy) cloud enabled GPS tracking device let's you track your keys, your pets, your remote controls, your purse/wallet - whatever, and includes both a temperature and motion sensors, for the ultimate flexibility in locating your lost or "misplaced" items, using a small white or black stone like device no bigger than a half dollar and equipped with a smart multifunction button for advanced features, all for only $25 each or the most popular 4-pack for $80. It even includes a chirp & flash function to assist you in locating your missing item day or night. Using this link, you can also take advantage of the Early Bird $40 combination while supplies last:
The software runs on any recent smartphone (iPhone 4+ or Android 4.4+) with Bluetooth 4 (and thus, the Low Energy function), and software is available now, and has been tested by thousands of existing PebbleBee Honey first generation GPS trackers. Get your own Pebblebee Stone: Item Trackers with Smart Button! Made in the USA. Never lose your keys again. If you're just forgetful or if you have kids that tend to 'move' or hide things for you - problem solved! The site has exhaustive Q&A as well as FAQ if you aren't already certain that you need these.
You can even program the smart button to make your phone scream if you tend to misplace it.
Full disclosure - I own a fleet of eight of the PebbleBee Honey first generation GPS trackers and two of these on order, and once you use this link, you can get your own to join the referral program, too.