Design Concept: infrared ray improves blood circulation, dissolves muscle fatigue, and relieves nerve pain in muscular tissue. Fabric band, used in conjunction with special silicon material, clings cozily on skin surface for easy adjustment and portability. Tensile silicon outer cover accommodates various heating devices. Charged via USB port of computer; instant heat supply when powered-on; power consumption lower than 1W. Material: Special infrared emitting element and peripheral material is made of silicon.