I bought a 12V car heater at Amazon;

Put 300ml bottled water into the thermos, The water is just enough to cooking a small cup of instant noodles;

Insert the cigarette lighter and start timing;

After reading the comments of the 12V car heater, I learned that some people said that the temperature of wires, handles and even power connectors was high, So I used the thermometer to detect the temperature many times;

The temperature of bottled water is about 10 ℃;

When heated for 7 minutes, the water temperature reaches 57 degrees, and the handle temperature is 40 degrees;

After 14 minutes, I estimated that the water temperature was close to 80 degrees, It is said to be the best temperature of the instant noodles；

Pull off the power connector and pour the hot water into the instant noodles cup;

It's ready to eat after seven minutes.

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