Haha, completely agree with this sentiment. By far the most attractive thing about this for me is being able to check my phone and immediately assuage that "Oh

Haha, completely agree with this sentiment. By far the most attractive thing about this for me is being able to check my phone and immediately assuage that "Oh shoot! Did I lock the front door?" feeling. It's something I've been thinking about a solution to for a while. One of these days I'll get around to making a key cover with a simple mechanical display of which direction the key was last rotated. Cool idea, right?