Meet the Walli: a smart wallet that connects to your iOS or Android device, allowing you to continuously monitor it everywhere you go. It sends you a notification when you are too far away from your wallet. The wallet can monitor your favorite card slot and send you an alert when its card is missing.
Walli has a wireless range of 100 feet, so when your phone is within range, you can double tap on your wallet to set an alarm on your phone. Walli runs on a coin cell battery for up to 6 months. You can find out more on Kickstarter.