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The Hand Warmer comes with a black charger cord. The cord is a USB plug, it can be plugged into anything that has a USB outlet. The most common are, cell phone charger adapter, laptop or computer, car charger adapter.
Mikey, we asked the vendor for some help with this and this is their reply back;
Yes there is a way to know when the device is fully charged.
Think of the three blue lights as a battery indicator.
When you first plug in the device the three blue lights blink fast. As the device charges one of the three blue lights will remain solid, while the other continue to blink. When the device is fully charged the three blue light will remain solid.
Hope this answers your question.