 With the ever-increasing capacity of a current battery, the risk of them catching fire becomes higher and higher. So what we have developed here is a thermally responsive polymer. So basically, if the battery overheats, it will shut off. This polymer we have contains a type of a conducting particle made of nickel, and the nickel particles has a lot of spikes. So when these spikes get close to each other, there will be electricity going through the polymer. So the polymer will thermally expand when it's heat up. And as the polymer expands, then it pulls the particles away from each other. Then electricity can no longer flow, then the battery is turned off. And then once the battery cools down, then this polymer will allow the battery to run normally again. And the heat gun is used to demonstrate that when there's heat applied, so the LED light turns off right away. But then when the heat gun is removed, the polymer cools down and the circuit is recovered and allows the device to be functional again. But the most important thing is to prevent the device catching fire.