The HRN-CT20T1 is a Tesla Model 3 OBDII adapter to connect to the Tesla diagnostic port, or Tesla OBDII port for 2018 vehicles only.
If you are looking for a Tesla adapter for the 2019 – 2020 Tesla Model 3, you need to purchase the HRN-CT20T11.
Length: 30 cm / 12 inches
Max length of connected cables: 2 meters / 6.5 feet
Other Tesla engine diagnostic port adapters:
2012-mid 2015 Tesla Model S OBDII Adapter
Mid 2015+ Tesla Model S OBDII Adapter
Tesla Model X OBDII Adapter
2019+ Tesla Model 3 and Model Y OBDII Adapter
Overview of Tesla OBDII Adapters
Geotab Features for Electric Vehicles