1. Operating Temperature Range: The working temperature of this electric vest is about ‑5℃ to 40℃, manually adjusted. USB interface power supply, carbon fiber heating wire, infrared heat, no harmful radiation. 2. 17 Area Heating: The electric vest has 17 area heating to take care of your back, neck, shoulders, waist and chest. Keeps you warm when you need it. 3. 3 Gear Control: This electric heating vest has 3 gear control, respectively, warm gear, 45 ℃, red lighting. Comfortable gear, 35 ℃, white lighting. Energy saving gear, 25 ℃, blue lighting. 4. Wide Use: Electric heating vest fashion warm, comfortable and breathable, is a nice companion for winter out. Whether you work outdoors or indoors, this vest can give you a comfortable experience. 5. Polyester Material: Our electric vest has a waterproof 3, which can support you to wash it with water, made of polyester fiber, and the lining is also made of polyester fiber. Spec: Item Type: Electric Vest Material: Polyester fiber Operating Temperature Range: About -5℃ to 40℃ Lining: 100% Polyester Waterproof Grade (IP): Grade 3 Power Supply: 5V 2A mobile power(not included) Temperature Change: Manual adjustment Warm Gear: 45℃ (Red lighting) Comfortable Gear: 35℃ (White lighting) Energy Saving Gear: 25℃ (Blue lighting) Use: Fashion warm, comfortable, breathable, a great companion for winter outings. How to Use: Plug in the power bank, long press the power button for 3 seconds to start preheating, and then adjust to medium temperature, the heating needs to be connected to the power bank all the time. Package List: 1 x Electric Heating Vest Note: 1. Manual measurement may have 0‑1cm error. Please make sure you don't mind before ordering.2. Size is the corresponding Asian size, EU and US size need to be two sizes larger.3. Cleaning instructions, machine washable, hand washable, please do not wring by hand.