HEATED ELECTRIC VEST UNISEX L WARM USB TANK TOP Function: 1. Operating temperature range: The working temperature of this electric vest is about ‑5 to 40, manually adjustable. USB interface power supply, carbon fiber heating wire, infrared heat, no harmful radiation. 2.17 Surface Heating: The electric vest has 17-surface heating to take care of your back, neck, shoulders, waist and chest. It warms you up when you need it. 3.3 Gear control: This electric heating vest has 3-speed control, warm gear, 45, red lighting respectively. Comfortable equipment, 35, white lighting. Energy saving equipment, 25 , blue lighting. 4. Wide application: Electric vest fashion warm, comfortable and breathable, is a nice companion for winter. Whether you're working outdoors or indoors, this vest can provide a comfortable experience. 5. Polyester material: Our electric vest has a waterproof level 3 that can help you wash it with water, made of polyester fiber, and the lining is also made of polyester fiber. Specification: Item Type: Electric Vest Material: Polyester fiber Operating temperature range: Approximately -5 to 40 Lining: 100% Polyester Waterproof grade (IP): grade 3 Power Supply: 5V 2A mobile power supply (not included) Temperature change: manual adjustment Warm gears: 45 (red lighting) Convenient tools: 35 (white lighting) Energy saving transmission: 25 (blue lighting) Application: Fashion warm, comfortable, breathable, great companion for winter trips. List of packages: 1 x Electric Heating Vest 1. Manual measurement may have an error of 0‑1cm. 2. Cleaning instructions, machine washable, hand wash, please do not twist by hand.