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You can find your keys, your pets, your luggage and anything by smartphone (app can even show you the distance between you and your belongings). It also can be use the bluetooth finder to find your smartphone when you can not find it anywhere at home or office or somewhere you often go.
when the distance between your phone and the finder reach its limit, the finder will automatically track its own location and send a signal to your phone, then your app can track the location and you will know where you have lost your finder.
When bluetooth distance is out of 20-30 meters and disconnected due to weak signal, the cell phone will be alarm and remind you the key or other objects will be lost.
