Passive RFID tags can't beep, so the locator would need to either use multiple antennas and fun algorithms (indoor location is pretty hard, especially if your device is small and the antennas are close together) or a highly directional antenna and user antenna-waving input.
The nice part about beeping locating tags (for those without hearing disabilities, of course) is that rather than using complex RF approaches to location, they just make noise and let the human do something they're already good at: locate a sound.
The nice part about beeping locating tags (for those without hearing disabilities, of course) is that rather than using complex RF approaches to location, they just make noise and let the human do something they're already good at: locate a sound.