13 Gears temperature can be controlled and adjusted arbitrarily, meet different demands. 2Put the power bank into the vest bag and carry it with you to keep heating anytime and anywhere. 3The high temperature red light is constant on, and the temperature is basically stable at 65. The middle temperature red light is constant on, and the temperature is basically stable at 55. The low temperature white light is constant on, and the temperature is basically stable at 45. 4Heating vest, warm in cold winter, three gear adjustment, suitable for cold areas. 5High quality polyurethane material manufacturing ensuring maximum durability.