1. Remote.

A remote control will unlock the doors and turn off the alarm and allow you entry to your vehicle.

2. Key.

A mechanical key will release the steering lock.

This is the normal key on your key ring, but will not start the modern car alone.

3. Transponder chip.

A coded 'electronic transponder chip' is read by the car when the key is inserted in the ignition. 

Electronic coded transponder chips are embedded in the plastic body of the key so when you turn the key in the ignition the code is read and the engine starts. If the transponder chip is broken or missing, the engine won't start.These keys are secure, but expensive and time consuming to replace if lost or broken.