Tesla provides you with two Model Y key cards, designed to fit in your wallet.
To use a key card to unlock or lock Model Y, position the card as shown and tap it against the card reader located approximately one third the way up of the driver's side door pillar. When Model Y detects the key card, the exterior lights flash, the mirrors unfold or fold (if Fold Mirrors is on), the horn sounds (if Lock Confirmation Sound is on), and the doors unlock or lock.
NOTE: You may need to physically touch the wireless phone charger or driver's side door pillar with the key card, and you may need to hold it against the transmitter for one or two seconds.
Once inside, power up Model Y by pressing the brake pedal within two minutes of scanning the key card. If you wait longer than two minutes, you must re-authenticate by placing the key card near the card reader located in the wireless phone charger on the center console. When your key card is detected, your two minute authentication period restarts.
NOTE: If enabled, Walk-Away Door Lock (see Walk-Away Door Lock) operates only when you walk away using a phone key or passive key fob. When you walk away carrying your key card, Model Y does not automatically unlock/lock.
CAUTION: Always carry your key card with you in your purse or wallet to use as a backup in case your authenticated phone has a dead battery, or is lost or stolen.