The functionality of a car key blade extends beyond simply unlocking a car door. Modern key blades often incorporate additional features that enhance the user experience and provide added security.

Many car key blades are now equipped with remote keyless entry systems. These systems use radio frequency (RF) technology to communicate with the vehicle, allowing the driver to lock and unlock doors, open the trunk, or even start the engine without physically inserting the key into the ignition.

Transponder keys are a step up from basic keyless entry systems. They contain a small chip that emits a unique signal to the car's immobilizer system, which must recognize the signal before the engine can be started. This adds an extra layer of security, as it prevents the car from being started with a copied key that does not have the correct transponder chip.

Some car key blades are integrated with a fob, which is a small handheld device that contains the remote control functions. This allows for the convenience of a key fob while still having the traditional key blade as a backup for situations where the battery in the fob may be dead.