You know, aside, I find it hilarious that most things that can take a bullet can't take an angry child with an aluminum baseball bat. Bullets only put tiny holes in people--we happen to not handle that very well. Blunt trauma is a different matter.
Get a "door bot" and whenever someone rings your doorbell you get a two way voice, one way video connection immediately to your smartphone. Cheaper than what you're looking for and easier to install too.
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