tag and receptor interacting

Guest
is there any device that would if the tag get within a certain
radius(360degree) of the device????

A- is on the table
and
B- is in you pocket

when you(B) get within 10m(1-2-5-10m whatever)
B notice A or warns you....??????????????

anything apreciate...I just found stuff about shoplifting tag which is
nothing like a interaction of A & B...............
 

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