One size fits most 21 button-activated Transformers sounds and phrases including a screaming Cybertronian battle riff Adjustable straps In the Transformers: The Last Knight a war is being fought between humans and Transformers and Optimus Prime is gone. But the key to saving the future is buried in the secrets of the past... Autobots, we are here and we are waiting, The epic words of Optimus Prime have inspired many to join the cause and fight for the freedom of all sentient beings. Now, you can issue an Autobot call to arms with the commanding power of the voice of Optimus Prime with this Transformers: The Last Knight Optimus Prime Voice Changer Mask. Don the helmet, find the hero within, and show that you too are more than meets the eye.