Features: brand new and high quality The belt provides deep warming function, reduces muscle and supports muscle recovery. The thermal belt can be operated with powerbank (not included) and USB power supply. 3-stage temperature provides soothing heat for the back and kidney area. Flexible size: can be adjusted according to different users or body parts. The fiber heating wire used as the heating material, which can be washed directly, and then placed in cool place to dry. Cant expose or grilled. How to use:Connect the USB plug with the power supply and long press the switch. Blue light, low temperature, about 40℃. Press the button, green light, medium temperature, about 45-55℃. Press the button again. Red light, high temperature, about 55-60℃. And then automatically constant temperature. The product will slowly increase the heat in 1 minute to circulate. Long press the button, all LED lights will go out, and then turn off. Specifications: Material: Polyester Color: Black Power Supply: USB Charging(Powerbank not included) Size: As pictures shown.(approx) Total Length: 122cm/48.03in Waist: 82-96cm/32.28-37.80in Package Includes: 1 x Vest note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!