Unigear Rechargeable Hand Warmers 5200mAh - Portable Electric Hand Warmer with USB Power Bank, 3 Heating Levels (95-131℉), Digital Display - Perfect for Raynaud's Syndrome, Winter Sports, Camping, Hiking & Outdoor Activities

How long does it stay on for? The hand warmers can work continuously for 4-8 hours, but the hand warmer' runtime really depends on two factors, the environment temperature and heating levels. How to turn off the heat? You can long-press the right button (same as the one you turned the heat on with) 3 seconds more, the screen shows the battery percentage and you can feel the temperature down. Then, you can just leave it on that screen and it will turn off after 30s, Or double press the left button to turn off directly. Can this warm and charge a phone at the same time? NO. For your safety, we have set a protection mode, which the two modes, charge and heat, cannot work at the same time. What in the package? 1* hand warmer, 1* USB-C charging cable, 1* USB-C to USB-A converter adapter,1* silicone lanyard, 1* velvet carrying pouch with drawstrings, 1* user manual