【4 HEAT LEVELS & SAFER】 Adjust 4 heat levels (40℃/104℉, 45℃/113℉, 50℃/122℉, 55℃/131℉)by pressing the power button repeatedly. Digital display the temperature, easy to check the heat level anytime. This neck warmer takes only a few seconds to heat up quickly, automatically cuts off power when the temperature above 55 °C by smart chips. In addition , it will be safer by using protecting jacket when the temperature is 50 °C or 55 °C and used in direct contact with skin. 【8000mAh CAPACITY & CHARGE POWER BANK】8000mah rechargeable battery with Type-C charging port can keep you warm for 5.5 hours in cold winter. It can also be used as a power bank to keep you powered in the home, at the office and on-the-go for your cell phone (iPhone, Samsung Galaxy), Tablet (iPad) or USB devices (Bluetooth Headphones, Bluetooth Speakers, etc.) . 【PERFECT GIFT IN WINTER】Surprise your mom, dad, grandma, grandpa, sister, brother, girlfriend, boyfriend, and anyone you cared about of women and men, with a best gift on festival, Birthday, anniversary in cold winter. The gift can not only make her/his heart warm, but also her/his neck and legs.