What is the smart key feature in the QX55?

The smart key feature in the QX55 is a keyless entry system that allows for easy access to the vehicle without the need to remove the key from your pocket. This innovation enhances convenience for the driver, enabling them to unlock the doors simply by approaching the vehicle. The smart key system also typically includes additional functionalities, such as starting the engine without inserting a traditional key, further illustrating its modern design and user-friendly technology.

In contrast, the other options describe functionalities that do not align with the smart key feature. A traditional key that must be inserted is counter to the concept of a smart key, which emphasizes a hands-free experience. A remote start feature that is only accessible from inside the vehicle lacks the convenience that the smart key system offers, as it is designed for immediate access upon approach. Lastly, a biometric sensor for keyless entry, while innovative, is not part of the QX55's standard smart key system, which relies on proximity-based technology rather than biometric verification.