You have two ears, because your ears are in different places and sound isn’t instant there will be a slight delay between what you hear in either ear. If the sound is coming from the left your left ear will hear it slightly before your right ear.
This is what your brain uses to figure out where a sound is coming from. Electronic beeping usually have a lot of patterns to the soundwaves and you brain is unable to tell if the left ear is ahead or behind of the right ear since everything repeats so often.
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