How does the Kia ProCeed's Smart Key work?

I've just bought a Kia ProCeed and noticed it has a Smart Key. I'm not sure how it differs from a regular key and how to use it properly. Could someone please explain?

Hey Jane, the Smart Key is a keyless entry and start system. It uses radio frequency and sensors to detect when you are close to your car and automatically unlocks the doors. To start the car, simply push the start/stop button with your foot on the brake pedal.

Hi Jane, the Smart Key also has a remote function that lets you start the engine from outside the car. To use it, press the lock button twice and then press and hold the engine start button until the lights flash.

Hi Jane, make sure to replace the Smart Key battery when it gets low. Otherwise, you may experience issues with starting the car or unlocking the doors.