Attention:Our Tag is Asian size, Please check sizing info in the product description below to make sure the item measurement before ordering.Color Of Button Controller:High temperature: red color 45°C Medium temperature: white color 35°C Low temperature: blue color 25°C Three temperatures can be selected by simple pressing a button on the heated vest.Specification:Material: cotton, polyester and waterproof materalStyle: unisex, fashion styleFeatures: Temperature AdjustableHeated Areas: Abdomen and back Power / Temperature Controller: on the chestUSB Input: 5v / 2AUSB Output: 5V / 2APacking list:1 x USB Charging Heating Jacket (not including mobile power)How to use:1. Pull out the USB plug2. Plug in the removable charger3. Turn on the removable charger4. Press the chest temperature control switch for two seconds.5. Flashing red light, it means automatic heating6. After the red light flashes for 5 minutes, then automatically turn to white light means medium temperature7. The manual setting temperature