Peltier modules or Peltier tiles utilize the Seebeck phenomenon, where a semi-conductor thermocouple material is flanked by 2 plates, if one side is hot and the other side is cold, the module will produce a voltage whose value is proportional to the temperature difference. This effect can be applied in reverse. If the module is electrified, it will produce heat on one side and cold on the other side. Jacket as a heater is applied when the ambient temperature is lower than the body temperature. The temperature of the heating jacket is 53.1 ℃. In the experiment 6000 mAh battery can provide power for Peltier for 35 minutes.