Bracelets as card for unlock door

My Ideas

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All of us working in companies with electronic security doors, and we should use magnetic card every day. I have kids, and they are playing outside every day. I have two options in this case (with kids) keeping unlock door whole day or my children always have to carry keys. But, every parents knows, kids very easy loose keys.
With magnetic bracelets and electronic door we will solve many problems with this and similar problems.

Just closer to the card reader, and our doors are unlocked. In this case, the reader would be at the gate near the keyhole.

What you think about this?