To transform into Kamen Rider Ark-One, the user presses the button of the Ark-One Progrise Key then the user sets it in the Ark Driver Zero and the belt will transform into the Ark Driver One and the Ark-One transformation sound will play. While it is in its Ark Driver One state, the user can play 11 finisher move sounds. Pressing the top button on the other hand will malicious voices of "fear", "anger", and "hate". Pressing the Key will activate the "Perfect Conclusion" finisher sound and the sound changes depending on how many times you pressed the top button.
Lastly, the DX Ark Driver contains voice lines coming from Ark (played by Sho Hayami), while the Ark-One Progrise Key has voice lines coming from Aruto Hiden (played by Fumiya Takahashi), and As (played by Noa Tsurushima). This Premium Bandai web exclusive item cost 8,250 yen and was released this month.