WARM FABRIC: Electric heating vest is made of thick fabric, breathable and ambiguous performance, comfortable and delicate, excellent color, soft hand feel halo, warm and comfortable to wear. RELIABLE USE: U2A or 2.4A USB output can better keep you warm. Insert the 10000mAh battery pack not included, this heated undershirt can keep warm for 7 hours at low level, 5 hours at medium level and 3 hours at high level. KEEP WARM: Built in heating component with three levels of heating from 25℃ to 45℃ generates constant heat to 9 areas including neck, back, abdomen and waist, keeping your body warm, boosting metabolism and relieving muscle pain and tension. WIDE SCENES: Electric heating vest is ideal for winter. You can wear it for skating, skiing, , shoveling, fishing, hiking and enjoying outdoor activities. STYLISH AND EXQUISITE: The electric heating vest features quilted seams, lightweight design and fine lining, allowing you to enjoy unlimited comfort in fall and winter. There is a zipper on the front to add a touch of fashion to the sophisticated look.