Duel Driver

A Duel Driver (デュエル・ドライバー Dyueru Doraibā) is a special transformation object in Kamen Rider Pendulum, used by Kamen Riders Pendulum, Xyz, Synchro, and Fusion. Transformations are determined using Form Cards.

Design
The Duel Driver normally takes the form of a Duel Disk, which it can be used as, but when the user needs to transform, the Disk can be converted into a belt-like device that can be worn around the waist. While in this form, the front of the Driver creates a Duel field that the user can place Form Cards, Weapon Cards, or Finisher Cards on in order to change their abilities, in addition to being able to use Monster Cards and Spell & Trap Cards like normal. These three Zones act like Monster Zones, while there is also a zone resembling a Spell & Trap Card Zone where the activation card, "Duel Driver Activator", can be placed.

The cards that a Rider uses with the Duel Driver are kept in a detachable compartment that, in Duel Disk mode, acts as the user's Extra Deck holder. By removing this compartment, the user can browse their cards more efficiently.

Duel Drivers can also be customized to fit their users, coming in more than one color and even having different vocal cues.

Functionality
To transform, the user must first activate the Duel Driver by placing "Duel Driver Activator" into the Activator Zone, causing the playing field to activate. The user can then place a Form Spell Card into the Form Zone in the Duel Driver, which will read the built-in technology in order to supply the Rider with the matching form.

While transformed, the user can use Weapon Cards in order to manifest armaments to battle with, but the Duel Driver's technology also allows the user to Summon monsters and activate Spell & Trap Cards using Real Solid Vision technology, letting the Rider fight alongside their monsters. To initiate the Duel Driver's finisher, the user must place a Finisher Card on their field that has its conditions met, assuming any exist. Alternatively, the user can initiate weapon finishers by placing Finisher Cards into a slot in the weapon currently being used. Both methods will read the internal technology and activate the corresponding finisher.

In order to have the Duel Driver cancel the transformation, the user must press a button on the side of the Driver to disengage the Duel field, which will also eject "Duel Driver Activator".