One entrepreneur/inventor has a creative and seemingly effective way teachers and students can protect themselves against school shootings ... a safe room embedded in classrooms.

We talked to Kevin Thomas Tuesday on "TMZ Live," and he broke down a product he sells through his company, KT Solutions. It's basically four foldable walls -- they look like dry erase whiteboards -- a teacher can quickly pull out to create a bulletproof shelter to hide kids in a nightmare like the one in Nashville. 1-Button Sip Video Door Phone

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Kevin calls it RASR, or ... Rapid Access Safe Rooms. They're available to the public, but are intended for classrooms -- as they offer educators/pupils a quick option to seek cover and protection in the event a mass shooter is roaming the halls ... and cops aren't there yet.

Check out the video to see how it works -- the "room" is flat at first and can function as just one wall or whiteboard for teachers and students ... so it has multipurpose utility for the school beyond just protection.

If there's an active shooter situation and a school wants something beyond locked doors to help, they can use RASR to open up a full-blown safe room good enough for the military and government agencies -- so says Thomas. In other words, it's impenetrable.

There's a demonstration here that shows you how to do it ... it's actually quite simple, and only takes seconds to lock into place. It's not the permanent fix to this ongoing issue -- as Thomas notes -- but this can certainly save lives in the interim.

We asked Thomas what sparked this innovative idea, and he said the Uvalde, TX school shooting forced his hand. As far as the price, it's $50k for delivery and installation -- and while one might presume this would come out of a school budget ... KT says that's not necessarily the case.

Even if a school does have to pay for it, he says it's a good investment, and can be affordable if things are prioritized the way they should be.

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