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safety feature

n. feature of an artifact that is added to insure a user's safety

Usage examples of "safety feature".

Anything different would be harder, and nobody in his right mind would design a safety feature to be complex.

It's a safety feature, and it's maybe the only thing a human pilot still has to do, except say 'Welcome to New York,' or whatever, and taxi to the gate.

Which is why on an expensive skateboard, like this one definitely is, you can get, as an extra added safety feature, the RadiKS Narrow Cone Tuned Shock Wave Projector.

But as you know, with the new models there's no need to fear losing one or having one captured in combat because of that built-in safety feature.