Product descriptionMaterial: polyesterSize: S-4XLPower interface: USBFever Area: BackFunction: keep warm, prevent water splashing and prevent colds;Application age: adult men / womenTemperature change (manual control)Warm: 45 (red light)Comfort: 35 (white light)Energy saving: 25 (blue light)The first picture shows the ordered productCharacteristics:This is an intelligence vest for you.With mobile energy storage pocket, easy travel.1 minute quickly heat up, dissipate cold, and keep warm.Set the temperature you want to respond to in different environments.Heating button, three stall temperature control, intelligent heating.It is machine washable and can be washed by hand. Do not twist it by hand.General USB interface power supply, longer service life, prevent water splashing and washable.The design is warm, comfortable and breathable and is a good partner for winter outings.How to use:1. Remove the USB plug2. Connect the removable charger3. Turn on the removable charger4. Press the chest temperature control switch for two seconds 5. Flashing red light means automatic heating;6. After the red light flashes for 5 minutes, then automatically change to white light, means medium temperature;7. Manual adjustment has three levels, red light means temperature heating continuously.White light means continuous medium heating, blue light means continuous low heating8. Press the chest temperature control switch for two seconds, it will turn off and stop heating;Washing instructions:1. Remove the removable charger.2. Neutral detergent is available followed by hand wash.3. Do not forcefully knead or beat.4. Air drying can be applied after nature.Warm Tips:1. If it is not used for a long time, do not connect the removable charger2. Do not use hot water or strong acid detergent.3. It is forbidden to use electricity to wet clothes, please turn off the power and stop using if the fabric is wet.4. Usage time depending on the capacity of the interchangeable charge.Package includes:1 x sleeveless vest (no mobile power)Remarks:1. Manual measurement, please allow 1 ~ 3cm error, thank you.2. Please leave us a message about the size you prefer, or we will send randomly.