Ford Mystique Owner's Manual page 79

Controls and Features
Remote Entry System (If equipped)
If your vehicle has the remote entry system, you can lock and
unlock the vehicle doors and open the trunk without using a
key. The remote also has a personal alarm feature. The controls
for the system are located on the hand held transmitter(s) that
came with your vehicle.
The system will work with up to four transmitters. Additional
transmitters can be ordered from your dealer.
The remote entry features only operate with the ignition in the
OFF position.
Remote entry transmitter
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