1. Adopt carbon fiber heating wire, which has fast heating speed, stable percompatible withmance, environmental protection and energy saving.2. Soft and comcompatible withtable lining, fine and delicate, warm and comcompatible withtable to wear.3. Use USB universal interface. In order to ensure the best heating effect, it is necessary to use mobile power supply with 5V/2A output.4. The vest has 5 heating areas, which can promote blood circulation and keep you warm, heat the stomach, back, waist and abdomen area to keep warm.5. The power interface shall be insulated and waterproof, without disassembly, and can be washed by hand or machine.Usage:(1) Unplug the USB plug.(2) Access the mobile charging power supply.(3) Press and hold the chest temperature control output switch compatible with 3 seconds.(4) Press the chest temperature control switch compatible with 3 seconds to start preheating, and then adjust the heat to a moderate temperature when the mobile power supply needs to be connected all the time.(5) Manually adjust to the third gear, the warm gear is 50 degrees Celsius, the comcompatible withtable gear is 45 degrees Celsius, and the energy saving gear is 40 degrees Celsius.(6) Press and hold the chest temperature control switch compatible with 3 seconds, and then turn off the lamp to stop heating.size:L(cm/inch) clothes length: 69 / 27.17, chest circumference: 106 / 41.73, shoulder width: 41.00 / 16.14, Hem: 98 / 38.58Material:Polyestercolour:RedPackage Contents:1 x Self-heating VestOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.