【Smart Graphene Technology】Graphene material has excellent thermal conductivity, the graphene film inside the heated belt can evenly transfer heat to the body, avoiding the problem of uneven heating of traditional pads, so as to more effectively and safely relieve muscle soreness, lower back, neck, knees, and shoulder pain, menstrual cramps, and reduced joint stiffness. 【Portable Convenience】Not built-in battery, with a USB charging cable equipped in the integrated pocket, the heating pad needs to be powered by a power bank (NOT INCLUDED) for portable convenience. 【3 Heating Levels】The warming pad features 3 heat settings, so you can choose the temperature that suits you according to your needs, the default mid-range (blue light) when starting up; built-in 2-hour timer, after 2 hours of continuous use, the waist pad will automatically shut down to to avoid waste electricity. 【Super Soft Flannel】Extra soft flannel provides cozy touch and texture. Comfortably hugs your body while delivering heat therapy to the specific area of ​​your pain. 【Universal Compatibility】The adjustable waist belt can be extended up to 98 inches, with a minimum length of 32 inches, suiting almost everyone's waist size; and this heated waist belt can be used not only for the lower back, but also for muscle soreness relief in shoulders, thighs, and more.