Built in 3000mAh battery without frequent charging, especially suitable for long-term outdoor activities or travel The compact and light weight design makes it easy to carry to any place, whether it's commuting or traveling, it can be easily placed in a bag Make of ABS to ensuring wear and drops resistance, suitable for long-term use Provide three temperature settings of 45℃, 55℃, and 60℃ to meet the warmth needs of different environments The unique design allows you to combine two hand warmers into a large, or use it separately to share warmth with others. Suitable for couples and friend to share warm during outdoor activities