Hot Wheels Color Shifters Cars Rescue Squad with Humvee & Dodge Charger SRT8 Car Set
From Mattel

Themed 2-pack of the new Hot Wheels® Color ShiftersTM vehicles with exclusive deco. Color ShiftersTM vehicles change color with warm or icy cold water for double the fun! Not for use with some Hot Wheels® sets.

• Amazon Sales Rank: #40820 in Toys & Games
• Brand: Mattel
• Model: N4442

It's Hot Wheels in Water!
My three-year old friend Robbie "found" these cars propped up on the side of his bathtub the evening of his birthday party. The very idea that anything changes colors is fascinating to little kids (some big kids too). That they are CARS that change colors sealed the deal. Robbie's Mom tells me that these Hot Wheels have gotten a true workout and continue to keep Robbie occupied. When one was misplaced, Robbie promptly picked up his (toy) telephone and called me to ask me to come help look for it. Can't ask for much more in a present, can you?

Does not work...
I bought my son 2 of these cars. He was so excited to see them change color. We submerged them in warm water, as stated on package, and absolutely nothing happened. We thought we were doing it wrong so we submerged it in very cold water, still, nothing happened; no change of color. Big waste of money--do not buy these Color Shifter toy cars!

Ripoff!
This product doesn't deliver what it promises. As a reward for exceptional behavior, this car was promised to my 3 year old. We talked and talked about how cool this car was, really building it up. He worked hard and earned the reward only to find out that it was a big dud! To get it to turn a different color you have to put it in the freezer, not very practical at all. Then when you take it out it immediately starts to revert to the original color.
The whole idea was to have it one color at room temp. then put it in the warm bath to change it's color. That would be really cool if it happened, but it doesn't.