This "gadget" I'm talking about is well known as a portable charger. These are extremely useful if you're in the car and your iPhone is giving you directions or if your battery is about to die and you need to check you connecting flight's plane status. What a portable charger does is it has a place where you plug in the USB end of your charger into the charger. You plug one end in the portable charger and one end in your device. So, it works like a normal charger. The cool part is when you're on the go you simply press a button and the portable charger turns on and charges your device. Before you use it you have to ore charge it. You just plug it into an outlet and it will charge. While your portable charger charges you can charge your device at once. You can charge up to two devices at once. These are around 20$-25$ but are well worth the reasonable payment. I definitely recommend this item. 
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