See also:

Advanced Key Suspend Function
If one key is left in the vehicle or trunk and the second key is used to lock the vehicle, the functions of the advanced key left in the vehicle or the trunk are temporarily suspended to prevent t ...

Safety
Side curtain-type airbags and seat-mounted side-impact airbags are optional in the Mazda6 i base sedan and standard in other models. Antilock brakes and traction control are standard. ...

Keys (without Advanced Key)
WARNING: Do not leave the key in your vehicle with children and keep them in a place where your children will not find or play with them: Leaving children in a vehicle with the key is dangerous. ...