Warm in the microwave. Cool and soft in the freezer. Soft type that fits perfectly on the body. Can be heated in a microwave. When kept in a household freezer, it cools from -10 to -20 degrees Fahrenheit and will not freeze it. It can be heated or chilled in the freezer, and it will fit anywhere on your body. Can be used repeatedly. > Gently transmits hot water from FFC activated water gel. Provides comfortable warmth on your shoulders, hips, and feet. > Gently transmits the cold of the soft ice of the FFC activated water gel. Provides a comfortable cold feeling on the shoulders, hips, and feet. [Material] Gel bag: Activated water, multi-valued alcohol, polymer water absorbing resin, polyethylene; [Size/ Weight] Body: W9.1 x H5.7 x D1.0 inches (W230 x H145 x D25 mm); [How to use] Place it in places where you want to warm it or cool down. (Do not put the gel bag directly against the skin. Heating Method: Place one gel bag in the middle of a clean plate. Make sure to check the high frequency output (wattage), and heat it according to the heating time notation. Heat it upside down after the surface is heated, and do not heat it above the heating time notation. If the bag inflates or bursts, immediately turn off the switch, and then place it for sufficient time and make sure it is cooled before opening the stove door. When removing it, do not hold it with bare hands, use a pot holder, etc. Heating time: Output: 500 W - 600 W. Output: 1 minute 30 seconds (front) / 1 minute 30 seconds (back) Output: 700 W - 800 W. 1 minute (front) / 1 minute (back) / 1 minute (back) / Output 900 W - 1000 W. / 50 seconds (rearound) / 50 seconds (cooling) / 50 seconds (cooling) / 50 seconds (cools in a plastic bag, etc. Note: The temperature and temperature of the temperature may differ depending on the outside temperature and body temperature. The temperature of the gel bag may vary due to differences in microwave and freezer manufacturers. When disposing, please follow the regulations of the local municipal.