Product Name: Rechargeable Battery for Pain Relief Belt Wrap Model NO.: SHO29 Knitted Type: Warp Style: Plain Pattern: Plain Dyed Technics: Knitted Application: Garment Feature: Far-Infrared Heated Therapy Cloth Transport Package: PP Bag Product Description Rating voltage: DC/5.0VRating power: 8W±1WTemperature level: H, M, L5V 2A/2.1A power supply, Low and safe voltage (power bank is not included).Press silicon button to select High, Midedle, Low Temperature level easily adjustable.With timer, Auto off after 3 hours working.Far infrared heating therapy keep your warm and good care for back pains.Optimum placement with one on the back provide quick warm-up and even distribution of heat where needed most.Operated by 5V power bank, Low and safe voltage.The high breathable fabric free size design provides additional flexibility needed in active outdoor sports.Provides up to 4-8 hours of comfortable warmth while enjoying favorite outdoor activities.