Have you ever wondered where you've left your keys again? With Elgato Smart Key, you have one thing less to worry about. Elgato Smart Key connects your keychain to your iPhone: now, your iPhone can notify you whenever you leave your keys behind, let you know where they were last seen, or help you find them by playing a sound. Always close. Elgato Smart Key is designed to be always by your side. With low energy Bluetooth Smart technology, the replaceable battery lasts more than half a year, and you won't even notice a hit on your iPhone's battery life. And don't be fooled by the compact size: sturdy materials and IP65 certified dust and water protection make Elgato Smart Key a worthy addition to the keys you count on every day.