If you have an iPhone you will require a Tailwind Vehicle Sensor (TVS) in your vehicle if you want the convenience of having Tailwind automatically open / close your garage door as you come and go using the proprietary, patent pending auto-open / close features of Tailwind. Apple will not allow the Tailwind app to detect the vehicle Bluetooth connection, making an external sensor necessary for the app to know which vehicle you're driving.
Some customers have success using Tailwind's integration with IFTTT to automatically open / close the door as they come and go. This approach does not need a Tailwind Vehicle Sensor. However, anyone who may get their hands on your phone could open your garage door by simply going to your house. If you're ok with that risk, then this may be an option that interests you. Our testing has also shown some significant time delays for the auto-open feature using the IFTTT integration for this purpose. Nobody wants to sit in their driveway for 10 minutes waiting for the door to open.
We can't help you troubleshoot any delays in auto-opening using the IFTTT solution, but we do want you to know that some customers are having good results with it. Others not so much, which is why we offer a Tailwind kit for only $10 more that includes one vehicle sensor.
In the meantime, we will keep asking Apple to reconsider.