The 3Doodler Create and PRO need to be plugged in in order to function. The PRO comes with a JetPack that, once fully charged, will allow the pen to be used wirelessly. The JetPack plugs into a wall socket and charges in about 3 hours. The JetPack is also available as a separately sold accessory for the 3Doodler Create.
The 3Doodler Start can be charged, however, as it has an internal battery. For more information about that, please see the 3Doodler Start FAQ section.