Nokia is finally unveiling its Treasure Tag accessory today, a $30 gadget that you can attach to keys, bags, and any other valuables you want to track. The Verge first revealed Nokia Treasure Tag back in July, and the current version looks identical to what Nokia was experimenting with nearly a year ago. Treasure Tag works by combining Bluetooth and NFC into a small match box-like device. Nokia has built a Treasure Tag application for Windows Phone that will let users manage the sensor and locate it when its lost. The app will also display the location of the sensor on a map, complete with Nokias HERE application.