Features:*1.Multiple heating zones and 3 temperature adjustments: carbon fiber heating element generates heating for the waist, abdomen and upper back; 3 one-key heating settings. You need to always connect the a5V2A power bank (this product does not include the power bank). *3. Safety and health: only 5V infrared heating, far lower than the human body safety voltage 36V. stable heating and human body safety voltage, better heating in the abdomen and waist area.*4. Large area heating: built-in heater and electric heating vest are many, with blood circulation and warmth function, not only can warm the stomach, back, waist and abdomen, but also promote blood circulation *5. Wide range of applications: this is outdoor activities, winter fishing, mountain biking, cycling, camping, snow trekking, hunting, outdoor activities, Ideal for winter streets, daily offices, etc.*6.Safe and lightweight.