I just checked out the ratp.fr site and it says this:



Paris Visite is a pass to discover Paris and its region.

The user's name must be written on the pass (no photo necessary). Each coupon is valid for either a 1, 2, 3 or 5 day period (calendar days and not a 24 hour period) of your choice: 1-3, 1-5, 1-8 zones.

You can purchase you pass in advance and avoid the queues, since ParisVisite is valid as of the first day of use and not the day of purchase.

With the Paris Visite pass travel freely within the zone area of your choice.

This pass offers a reduced rate for children between 4 and 11 years of age.

This pass is on sale in all metro, RER and SNCF stations, the Orly and Charles de Gaulle airports and in certain Parisian hotels and many tour operators abroad.

Before utilisation, write your name on the card and copy the coupon number on the card, also the pass expiration date.