Meet the SafeWallet: a smart wallet that relies on sensors to prevent theft. It rings loudly to remind you when someone is about to steal your wallet. You also get an alert when you have left your wallet or phone apart. You can use the companion app for it to make your wallet ring.
The SafeWallet relies on light and motion sensors to detect theft attempts. It is smart enough not to mistake you for thieves. You can find out more about it on Kickstarter.