Tired of losing your wallet? There’s finally an easy solution. This ultra-slim tracker card connects to your smart phone and allows you to locate and ring your card holder any time, anywhere. All of this is possible with a 3mm card which only requires three hours of sunlight to last a full month. You can buy it with some of Ekster’s ultra-slim wallets—which look great and are highly functional, by the way—or simply slide it into your current wallet.