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Use the keys to turn on and off the power system, and to lock and unlock the doors and to open the trunk. You can also use the remote transmitter to lock and unlock the doors and trunk, and open the charge lid. Communication between the smart entry remote and the vehicle consumes the smart entry remote’s battery.
Battery life is about two years, but this varies depending on regularity of use. The battery is consumed whenever the smart entry remote is receiving strong radio waves. Avoid placing it near electrical appliances such as televisions and personal computers.