Heater "Brr" insulates hands from the hot cup, keeps the heat and warms frozen hands.
热水器“糙米率“由热绝缘杯手，保持热量和温暖冰冻的手。
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Now it is widely used in a series of small electrical heater such as hair curler, temperature invariable cup, temperature invariable bottle, electrical hot board, dryer, hand warmer and so on.