1. Heating Level: Ensuring quick heating, the hand heater has 3 heat level, which will bring your more warmth in the cold winters. 2. Higher Safety: Built in 4000mAh battery is explosion proof, while this hand warmer also has aluminium alloy thermal conductor. 3. Wide in Using: Very suitable for outdoor, travel, work, hunting, sports, fishing, hiking, skiing, camping, cycling and so on. 4. Easy Carrying: Compact size enables easier holding in your hand, and the lanyard design largely simplifies carrying and storage. 5. Ideal Present: This is a must have to get through snowy days, and great gift for Thanksgiving, Christmas, New Years and more. Specification: Item Type: Hand Warmer Product Material: ABS Built in Lithium Ion Battery: 4000mAh Package List: 1 xHand Warmer 1 x USB Charging CableHigher Safety: Built in 4000mAh battery is explosion proof, while this hand warmer also has aluminium alloy thermal conductor. Ideal Present: This is a must have to get through snowy days, and great gift for Thanksgiving, Christmas, New Years and more. Wide in Using: Very suitable for outdoor, travel, work, hunting, sports, fishing, hiking, skiing, camping, cycling and so on. Easy Carrying: Compact size enables easier holding in your hand, and the lanyard design largely simplifies carrying and storage. Heating Level: Ensuring quick heating, the hand heater has 3 heat level, which will bring your more warmth in the cold winters.