Perhaps better still: make the targets to be found use completely passive RFID tags. (No batteries needed, ever.) Make the 'finder' unit a powered, portable wa

Perhaps better still: make the targets to be found use completely passive RFID tags. (No batteries needed, ever.) Make the 'finder' unit a powered, portable wand-like device which pulses the tags, and makes sound or light in proportion to how well it is pointed toward the desired target, and how close it is. (Regress to finding a misplaced 'finder' wand: give the wand a charging base station with the basic push-button-and-wand-beeps behavior. This base station might also include whatever UI selects which target you're seeking.) With this design bluetooth is probably not involved or beneficial.