O Cathedral ( オーカテドラル, Ō Katedoraru) - A device within the Force Drive.

The pattern engraved on it is a conduit that guides the sealed life energy to safely release.

Force Drive ( フォースドライブ, Fōsu Doraibu) - The axis upon which the O Slater tilts.

Medacryster ( メダクリスタ, Medakurisuta) - A part within the O Slater, it has a function that converges the vital energy released from the medals into one direction.

After tilting it, the O Slater enters a state that allows the O Scanner to release life energy from the medals. When loading medals, the O Slater is in a horizontal position. It is responsible for awakening the power within the O Medals.

O Slater ( オースレイター, Ō Sureitā) - The central panel on the OOO Driver.

The OOO Driver consists of the following parts: To transform into OOO, Eiji inserts three Core Medals into the O Slater ( オースレイター, Ō Sureitā), turns the O Slater on the Force Drive ( フォースドライブ, Fōsu Doraibu), scans the Core Medals with the O Scanner, and then holds the O Scanner up to his chest.

The Six Group OOO Driver (六連オーズドライバー Mutsure Ōzu Doraibā) is an S.I.C.-exclusive variant with 6 Medal slots used by Boss to become OOOOOO (Hexa OOO) using the Core Medals for Shocker, Gel Shocker, Destron, G.O.D., the Garander Empire, and Delzer.

「 Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals」 All the clones of OOO Gatakiriba created by the Combo's Branch Shade ability sport working OOO Drivers, which allowed a group of eight OOOs to transform into each of his combos, Gatakiriba, Latorartar, Sagohzo, Shauta, Tajadol, Putotyra, and Burakawani, after being given Core Medals by the Greeed.

As Eiji was the one who undid the seal, the Driver will only work on him and no on else, though they can help him scan the Medals for as long as Eiji is wearing the Driver and the target of transformation. However, it broke because it detected Eiji's lack of desire, making him the perfect host. According to Ankh, it was originally the seal that kept the Greeed in their 800-year slumber.

Kamen rider ooo flash