This 2-in-1 rechargeable hand warmer and charging power bank is a must-have accessory for all your camping, hiking and outdoors excursions. It's also great for your bug-out bag when you have to disappear for a while. It will keep your hands warm for up to seven hours, with a heat output of 45 degrees Celsius / 113 degrees Fahrenheit. It will also recharge most smartphones and other digital devices such as tablets. It will charge a Samsung S5 in 2 hours; an iPad Mini in 3 1/2 hours; and an iPad 2 in 2 hours 40 minutes. This hand warmer is fully charged in 5 hours 42 minutes, using a 1A AC adapter.