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It is called the "Porsche Battery Maintainer",
Pt. no. 000 043 202 56.
According to the description in the Boxster Tequipment catalog it provides "Simple and safe battery charging via the cigarette lighter socket recommended after the vehicle has been left standing for longer periods."
Looks like it consists of a dc converter, a lighter socket plug, plus an additional cable with battery clamps on it.
I don't actually know whether it requires the battery cables in the car to be disconnected while the battery is being "maintained", or whether you can keep everything connected. Hopefully the latter.
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