I. Principle

1. **Far infrared characteristics** - Far infrared is a type of infrared with a wavelength between 4 and 1000 microns. The far infrared in the range of 4 to 14 microns is similar to the far infrared emitted by the human body and is called "life ray". The far infrared emitted by the far infrared heater in the far infrared sauna room can resonate with human cells. - This resonance causes the water molecules in the cells to vibrate strongly. The water molecules rub against each other during the vibration process to generate heat, thereby heating the inside of the human body, rather than just heating the air around the human body.

2. **Difference in heating from traditional saunas** - In traditional saunas, the temperature of the indoor air is first increased by heating stones or other heat sources, and then the human body sweats by contact with the high-temperature air. Far infrared saunas heat the inside of the human body directly. For example, a traditional sauna may need to heat the indoor air to 70-100°C to achieve a sweating effect, while a far infrared sauna can make the human body sweat at a relatively low temperature of 45-60°C.

II. Features

(I) Temperature and comfort 1. **Low temperature and efficient sweating** - Far infrared saunas can still sweat a lot at low temperatures, which is suitable for the elderly and those with weak constitutions.

2. **Fresh air** - Since high temperature is not required, the air in far infrared saunas is fresh and users feel comfortable.

(II) Heating method

1. **Deep penetration heating** - Far infrared rays penetrate the skin, promote blood circulation, relieve muscle pain and joint inflammation.

2. **Uniform heating** - Far infrared saunas heat evenly, avoiding local overheating of traditional saunas.

3. **Diabetic patients** - Diabetic patients need to consult a doctor, strictly control the use time and temperature, and monitor blood sugar.

(III) Energy saving and environmental protection

1. **Energy consumption** - Far infrared saunas convert electrical energy into far infrared radiation, which acts directly on the body.

1. **Pregnant women** - Pregnant women should consult a doctor before use to avoid the impact of high temperature on the fetus.

2. **Patients with cardiovascular disease** - Patients with cardiovascular disease should use it with caution. Moderate sauna can help blood circulation, but a doctor's permission is required.

IV. Frequency and duration of use

1. **First use** - It is recommended to start with 10-15 minutes for the first use to adapt to far infrared heating.

2. **Use regularly** - Healthy people should use it 2-3 times a week. Excessive use may cause fatigue.