This orthopedic electric heating bag heats up in about 5 to10 minutes after plugging into a power socket. Once heated, it can stay warm for up to 1to 2 hours, providing soothing heat therapy for various body pains and muscle relaxation. It does not require filling with water, making it easy and safe to use at home, office, or while traveling.Multicolor Electric Hot Gel Bag for Back Pain (Orthopedic Electric Heating Pad) is a portable heat-therapy device designed to provide quick relief from muscle pain, back pain, joint stiffness, and menstrual cramps. It contains a pre-filled gel pouch that heats up when plugged into electricity and retains warmth for a long time, making it a convenient alternative to traditional hot water bags.