Youpufa Nut 2 Smart Bluetooth 4.0 Item Finder/Tracker/Locater for Anything App Fit for Android and IOS (White) Place or stick nuts on multiple items (like your keys, cars, luggage, remote control or purse) so you find them when they go missing When you begin searching for a lost item, your iPhone tracks the Bluetooth signal strength of your nut. As the signal draws you closer, nut's distinctive melody can be heard until your lost item is back in your hands. While nut does NOT have GPS real-time location information, the app does automatically record the last place your phone saw your nut. Because if you have to retrace your steps, it's good to know where to start looking Mark your nut as Supports Apple devices using iOS 7 or 8 and Android devices using 4.4 or higher