Do more than just carry your cash. Protect your important items with the Volterman Lightweight Smart Wallet. Despite looking classically beautiful, it really goes the extra mile. Hidden under the leather exterior is a built-in power bank that offers wireless charging. In addition, it uses its connection to the app on your smartphone to know when to activate the built-in distance alarm. If you leave your wallet behind, you get an instant alert. Likewise, the wallet can also alert you if you leave your phone behind.