The Hot Wheels Monster Trucks Color Reveal features 1:64 scale trucks inside a barrel drum with a clip-on water tank, all covered in a special Color Reveal coating. The surprise reveal is triggered by filling the drum with water, swirling the truck, and then watching the coating wash away to reveal a new deco. The truck's appearance can be changed by dunking it in cold or warm water, and the water tank can be used to spray other Color Shifters trucks, changing their deco as well. 

Here's a more detailed breakdown:

Initial Reveal:

1. Unboxing: The truck comes inside a barrel drum with a clip-on water tank.
2. Water Reveal: Fill the drum with water, swirl the truck, and watch the water change color as the Color Reveal coating washes off.
3. New Deco: Pull the truck out to reveal the new deco underneath the coating. 

Color-Changing Fun:

1. Cold Water Reveal: Dunk the truck in ice-cold water to reveal another color scheme.
2. Warm Water Reveal: Change back to the original color scheme by dunking in warm water.
3. Water Battles: Use the clip-on water tank to spray other Color Shifters trucks with cold or warm water, changing their decos on contact. 

Key Features:

• Color Reveal Coating:

  A special coating that hides the truck's initial design, which is revealed when submerged in water. 

• Clip-on Water Tank:

  A water tank that can be attached to the truck and used to spray water on other trucks, causing a color change. 

• Barrel Drum:

  The packaging, which can be used for initial reveal, color-shifting dunking, and storage. 

• Variety:

  Different Monster Trucks are available in different packages, encouraging collection.