DESCRIPTION: Safety : Heated Vest have Built-in Thermal Protection Module. Once it is overheat, it would stop until the heat return to the standard temperature. Usage Method: 1: Access to portable sourceThe power bank uses USB interface and the lithium battery uses DC interface; 2: Press and hold the temperature control switch for 2 seconds, automatic temperature heating for 5 minutes ; 3: Thenthe red light will automatically turn white to medium temperature control ; 4: 3 modes are high temperature , medium temperature and low temperature heating ; 5: Long press the chest temperature control switch for 2 seconds, turn off the lamp to stop heating Washing Instructions: Take out the power bank, put the USB interface cable into the pocket, add neutral detergent to hand wash, do not rub or beat violently, and dry the washed clothes naturally before use Matters Needing Attention: 1: If not used for a long time, please remove the portable source ; 2: Do not use hot water or strong acid detergent; 3: Do not use electricity for wet clothes. Please turn off the power supply and stop using it if you are wet in the rain; 4: The service time depends on the capacity of the portable source Specification: Function: breathable, waterproof, ultra-light, warm Lining: 100% cotton Fabric: Chemical fiber blend Color: black, yellow Size: as shown in the picture Fastening: Zipper Collar Style: Band Size Tips: Attention!Our Size are Tag Size (Asian Size ), they are smaller than US/UK/AU Size. Please check the size chart below to choose the right size for your baby!!! Package Contents: 1PC*jacket