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.
Now do you really think your walls of your home, or Concrete blocks will protect you from those?
__________________ Ren: Now listen, Cadet. I've got a job for you. See this button? Ren: Don't touch it! It's the History Eraser button, you fool! Stimpy: So what'll happen? Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?
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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