3 Temperature Adjustment: Neck warmer has 3 temperature (37/98.6, 45/113, 55/131). One button to switch three different temperature. Neck warmer heats up quickly in just a few seconds, and stops heating when the smart chip reaches a temperature of 55C Adjustable Neck Warmer: Neck warmer covering the neck with flexible and soft high quality silicone, which allows you adjust it as your like. Anti-slide design can effectively prevent sliding. Comfy to wear. Just put it on your neck and enjoy the warmer Multifunction: The unique design of rechargable neck warmer allows you to not only use it for your neck, but also promote blood flow to hands, legs even the shoulders. Portable neck warmer can quickly heat up in several seconds. Kids and adults all can wear it to enjoy a warm winter Charge Power Bank: 8000mAh Neck warmer 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, Tablet or USB devices. You and your mobile device will be able to enjoy a charge wherever you go Perfect Gift in Winter: Neck warmer will be a great gift whatever cold winter, birthday, festival, anniversary, celebration, and others. Your family, lover, friends and anyone you cared about of women and men will be happy when they receive it. The gift can not only make her/his heart warm, but also her/his neck and legs