1. 100% real high capacity of 4000mAh.
2. Function: 1) Hand Warmer ; 2) power bank charger
3. Button control: yes.
4. Compact, lightweight, portable & stylish design, easy to carry with.
5. Build-in high quality Lithium battery cells: more than 500 charge cycles during the course of its life.
6. High quality: All our products would be strictly tested before the delivery.
7. Package:Gift box packing.