It's not, you'll still need to lock your car up. All this does is provides a shade for the windows and interior. No guarantee if someone will snap the cover away either since it's just uses the wipers to hold down where the windshield is, two band that wraps around the mirrors and finally 2 Velcro that attach to the rear engine vent louver. This customer fit for NSX, not a generic one and it's really good material. I highly recommend this and Hrant is great to deal with. Not sure the one from Amazon.
Frankie