暖手炉，又称怀炉，样式轻巧。亮丽造型让在－40度之寒冷地带亦可正常使用，最适用手脚冰冷症、寒冷感冒症、神经痛、风湿痛、腰酸背痛、长期卧病患者,而须要在寒冷天气外出运动或是工作的的人。
方法：改造电热暖手炉，用不同动作温度的温控器多次测试。
Methods an electric hand warmer was transformed and tests were made many times with different movement temperature of thermostat.
而皇室成员还会配备手炉脚炉来暖手暖脚，可随身携带，灵敏巧致。
The members of the royal family will be equipped with the foot to hand warmer warming hands feet, can carry, how sensitive.
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