Ford Mystique Owner's Manual page 58

If the driver's door is open while the key is still in the ignition,
a warning chime sounds.
Always set the parking brake fully and make sure that
the gearshift is securely latched in P (Park) (automatic
transaxle) or in 1 (First) (manual transaxle).
Do not leave children, unreliable adults, or pets
unattended in your vehicle.
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