Specification: Material: Polyester Weight: 0.5kg Function: keep warm, heat Power: 5V2A Features: 4 control zones，13 heating Areas Fever in zone 15  back, neck, shoulders, waist, both sides of abdomen. After turning on the power, you can feel the warmth all over your body. Temperature ： LOW(Blue light):25℃ MID(White light):35℃ HIGH (Red light):45℃ Feature: 1.One Minute fast heat, dispelling cold and keeping you warm. 2.Set the temperature you want to respond to a variety of environments. 3.A button to heating, three stall temperature control, intelligent heating. 4.It can be washed by machine and can be washed by hand. Do not wring it by hand. 5.General USB interface power supply, longer service life, anti water splashing and washable. 6.The fashion is warm, comfortable and breathable, and its a good partner for your winter going out. Package Included: 1 x Heated Jackets Vest（power bank not included） Note: The product does not include power banks. You need to use 5V.2A 20000Ah or more power bank.