The HRN-CT20T11 is an OBDII adapter for the 2019 Tesla Model 3 year and for the 2020 Tesla Model 3, to connect to the Tesla OBDII engine diagnostics port.
If you are looking for an OBDII port adapter for the 2018 Tesla Model 3, you need to purchase the HRN-CT20T1. See the image below to verify the correct adapter.
Length: 30 cm / 12 inches
Max length of connected cables: 2 meters / 6.5 feet
Other Tesla Adapters:
2012-2015 Tesla Model S OBDII Adapter
2016+ Tesla Model S OBDII Adapter
Tesla Model X OBDII Adapter
2018 Tesla Model 3 OBDII Adapter
Overview of Tesla Adapters
Geotab Features for Electric Vehicles