Hand warmer Function: Four temperature mode optional and will be heating at 5 seconds. You can choose the best one according your need. The highest temperature is 140℉ that is appropriate temperature. Power bank Function: 5000mAh capacity USB power bank. Charging for your phone or other digital equipment in case power off when you are in outdoors. LED Night light Function: Four colors night light . Light up to highest brightness level, press light key to choose from the highest to the lowest brightness and light off. Also as an emergency light in Dark environment. One-hand size:The size of the hand warmer is suitable for one hand. The best gift to family and friends. Special Offers: Save 50% on this item when you purchase 1 or more Hair Massage Brush offered by BMK BLUEMICKEY. For more details please refer to the following "Special Offers and Product Promotions"