Keep Your Body Toasty: Built in with quality carbon fiber heat elements and 3 heating levels (131F, 122F & 113F) to generate consistent heat for 9 core body parts, including your neck, back, abdomen, and waist, helping to maintain body warmth, promote blood circulation, and relieve pain as well as tension in muscles.USB-Powered for Lasting Heat: Plugged into a 10000mAh battery pack (not included), this polished heated vest is capable of retaining warmth up to 6 hours at Low Level.Lightweight Design: Featuring quilted, lightweight design and fine interior lining for unrestricted comfort and coziness in fall and winter. With a zipper on the front, you can layer this unisex usb heated vest over varieties of tops to add a touch of style for refined looks.