See also:

Loss of a remote key
If either of the remote keys is lost, the other should be taken with the car to a Volvo retailer. As an anti-theft measure, the code of the lost remote key must be erased from the system. NO ...

Dimensions–S60
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Keyless drive
Vehicles equipped with the optional Personal Car Communicator have the keyless drive function, see page 63 for detailed information. ...