Mac laptop AC power cords that use the two-pronged adapter with the two blades that swing out produce high AC electric field EMFs when you touch the laptop. To avoid this, you need to ground the power cord.
Until recently, you could use the cord with the three-pronged plug at the end that came in the box with the laptop. Unfortunately until recently Apple ceased providing them with newer models.
If your Mac laptop did not come with this grounded cord or you have lost it, you can use this one safely.
This adapter is plugged into one corner of the white in-line transformer box so you can plug the transformer box directly into a surge protector or wall AC outlet.
To use:
Pull the two-pronged adapter off the white transformer box (and discard). Slide the end of the grounded AC power cord onto the corner of the white transformer box where the adapter slid off of, and now your Mac laptop is grounded.
*Please note this cable is not Apple branded.
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