Self heating pad with 40 ℃

Where is the best place to paste the heating pad?   First of all, there must be a layer of clothing stickers. No matter what kind of heating pad stickers, it will reach a certain temperature, about 30 or 40 degrees. This kind of temperature will burn the skin directly in contact with the skin. Be careful! To   1. If you want to keep your back warm, take off your coat to expose the position of your back underwear. You only need a layer of underwear. To   2. If it is a foot warmer, pay attention to it on the surface of the foot, not the bottom of the foot. To   3. If you are in menstruation, you can choose to stick it on the lower abdomen under the belly button of the coat. ...   4. If you suffer from indigestion due to the cold in winter, you can apply it to the stomach. In this way, people will feel warm and promote the digestion and absorption of nutrients. Note that it is not directly attached to the skin. To…