Features1Three gears can control temperature and adjust it arbitrarily, put power bank in the vest bag and carry it with you to keep heating anytime and anywhere. 2Four heating zones, back heating zone improves air?conditioning wind chill, back stiffness and strain. 3Ward off cold and warm, USB power supply, smart heating, composite fiber heating material. 4Shoulder hot zone, relieve shoulder pain, shoulder strain and cervical spondylosis. 5Hot area of abdomen can improve gastrointestinal problems, promote digestion and keep abdomen warm, effectively resisting invasion of wind and cold. 6Lumbar hot zone improves lumbar intervertebral disc, cold waist, and waist is strained.SpecificationCondition: 100% Brand NewItem Type: Heated VestMaterial: Polyurethane fibreInstructions: Connect the plug-in USB in the pocket of clothes to power bank and press switch on the clothes for three seconds. The indicator light is on to indicate heat. Press lightly to change gears. Red is high-end 65C, white is mid-range 55C, blue is low-end 45C .Features:Three gears can control temperature and adjust it arbitrarily. Put power bank in the vest bag and carry it with you to keep heating anytime and anywhere. Waterproof fabric, washable. Waterproof and warm, anti-wrinkle and abrasion resistance, easy to take care of.SizeLengthShoulder Width1/2 BustNeck LineM38.5cm / 15.2in60cm / 23.6in48cm / 18.9in52cm / 20.5inL41cm / 16.1in62cm / 24.4in50cm / 19.7in53cm / 20.9inXL42.5cm / 16.7in64cm / 25.2in52cm / 20.5in54cm / 21.3in2XL44cm / 17.3in66cm / 26in54cm / 21.3in55cm / 21.7in3XL45.5cm / 17.9in68cm / 26.8in56cm / 22in56cm / 22inPackage List1 x Electric Heating Vest