It ought to be pretty difficult to actually lose your keys, bag or other personal belongings if you have a Nokia Treasure Tag. The small device measures 30 millimeters square and 10 millimeters thick. Inside are both Bluetooth and NFC, which are used to pair with and communicate with a Windows Phone. A Treasure Tag app will alert your phone if you’re ever more than 30 feet from the Treasure Tag, and therefore from the attached object. Nokia is offering the Treasure Tags in four colors for $29.90 each in April. The app supports up to four Tags and if your belongings are left behind, you can track their last location using Nokia Here maps.