These keys are featured on more and more cars each year.
When you have a Prox/Smart Key, you do not need to use the key to start the car.
By having the key close by, it communicates with the car, so just push the start button and your ready to go.
These types of keys have to be programed into the car.
Emergency Key: Yes, there is a “key”.
If you have a dead battery, this key is generally used to unlock the vehicle, in some instances, it may be used to start the vehicle.