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Application seems like associate device that offers associate sounding or alternative signal once it's near to metal, used for instance to look for buried objects or to sight metal person free.
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Advantages

*Disclosure of buried metals
*Easy to use app
*Sound happens whereas metal detectors
*Sound result on/off
*You will update it on every occasion you're run
*You will share together with your friends
*Its size is little and proportional to any or all phones
It operates within the devices, that contain sensing element

Finally, if you wish the appliance doesn't skimp on on country to publish and share it together with your friends