OK, so the robot apocalypse probably won’t happen any time soon, but the new robot sentries guarding Microsoft’s Silicon Valley campus seem like something straight out of a futuristic sci-fi movie.

According to ExtremeTech, each of the K5 security guard robots from robotics company Knightscope stands 5 feet tall and weighs 300 pounds, so you probably don’t want to mess with one.

The K5 robots don’t come with any weapons onboard—thankfully—but they use a suite of alarms, sirens, and cameras to monitor and patrol the grounds of Microsoft’s campus. If one spots trouble, it’ll either sound an alarm or dispatch a human security guard to its location. 

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