How to use: First, transform the 5 - inch Optimus Prime toy from robot to truck mode in 9 steps. Then, attach the trailer to the truck. You can either tow it around or open it up to use the battle base. Place a Warrior Class vehicle (if you have one) inside the trailer. To stage battles, use the Cannon Charge and Energon Axe Attack modes. Note: Warrior Class vehicles are sold separately and availability may vary. Keep small parts away from children under 3 to avoid choking hazards. Maintenance: Wipe the toy with a clean, dry cloth. Avoid getting it wet to prevent damage to the toy's moving parts.