Tamara Warren, writing for The Verge:

And the best part: when I pulled into park, I asked about the key. The car doesn’t haven’t one. You control the car through the Tesla app on your phone. Tesla has succeed in making a car for gadgeteers, and for forgetful people like me that sometimes leave their phones behind. (It does have a small credit card key to hand off to valets, for people that will stunt in their 3.)

I can imagine a few scenarios where that’s a bad idea. They should add one of those rubber band Fitbit-like devices, which you can put on your wrist. I think Range Rover or Volvo does them.