Features： 1、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. 2、Four heating zones, back heating zone improves air?conditioning wind chill, back stiffness and strain. 3、Ward off cold and warm, USB power supply, smart heating, composite fiber heating material. 4、Shoulder hot zone, relieve shoulder pain, shoulder strain and cervical spondylosis. 5、Hot area of abdomen can improve gastrointestinal problems, promote digestion and keep abdomen warm, effectively resisting invasion of wind and cold. 6、Lumbar hot zone improves lumbar intervertebral disc, cold waist, and waist is strained. Specification： Item Type: Heated Vest Material: Polyurethane fibre Instructions: 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 65 DegreeC, white is mid-range 55 DegreeC, blue is low-end 45 DegreeC . 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 Line M38.5cm / 15.2in60cm / 23.6in48cm / 18.9in52cm / 20.5in L41cm / 16.1in62cm / 24.4in50cm / 19.7in53cm / 20.9in XL42.5cm / 16.7in64cm / 25.2in52cm / 20.5in54cm / 21.3in 2XL44cm / 17.3in66cm / 26in54cm / 21.3in55cm / 21.7in 3XL45.5cm / 17.9in68cm / 26.8in56cm / 22in56cm / 22in Package List： 1 x Electric Heating Vest