Winston posted this in another thread, but it's got some interesting info in it:
Looks like each Model 3 will come with two key cards. After you've authenticated with a key card you'll have 15 seconds to start the car or else you need to authenticate again. You will also be able to pair up to 3 smartphones via bluetooth.
The manual also states that "Tesla does not support the use of third party applications to contact Model 3", so that could be bad for those hoping to use the Remote S app instead of the official Tesla app.
For anyone interested, the short-term confidentiality on Tesla's "B-pillar Endpoint" expired recently, so photos of the unit and an excerpt from the manual is now available from the FCC.
OET List Exhibits Report
It has a TI CC2640R2F which is a Bluetooth 5 capable chip. CC2640R2F SimpleLink Bluetooth® low energy Wireless MCU | TI.com
Looks like each Model 3 will come with two key cards. After you've authenticated with a key card you'll have 15 seconds to start the car or else you need to authenticate again. You will also be able to pair up to 3 smartphones via bluetooth.
The manual also states that "Tesla does not support the use of third party applications to contact Model 3", so that could be bad for those hoping to use the Remote S app instead of the official Tesla app.