Use it to access any HAUP vehicles you reserved.
To unlock, hold your HAUPcard against the card reader on the front windshield. Hold the Zipcard steady for a few seconds, and the doors will unlock.
To lock, do the same to lock the car.
Don't take the keys
Some cars might have car keys attach to the streering wheel. The car keys should stay in the car. Always use your Zipcard to lock and unlock at the start or end of your reservation to prevent any exccess charges.