Features
1) charging of batteries via the USB port. Optional four AAA batteries or four AA batteries or two AAA rechargeable batteries or two AA batteries or two AAA rechargeable batteries with two AA batteries.
Charging 2) means inserted batteries via the USB port on other devices with USB charging port, such as smartphones, tablets, portable speakers, and so on. So Thus, it also serves as an external Power Bank.
Switching between the two modes is done by pressing the oblong button visible in the photo.
The device is conveniently a USB plug to USB plug in, which at the one end, another plug adapter is attached. These are currently in cell phone adapter, which include a micro-USB port and a mini-USB port count. But it can also be used any other USB cable.
Rating
The value for money I think that is excellent. I had previously bought for almost the same price a device that had only one "current donation function" and I was not quite sure whether this device inserted also serves to recharge when I ordered it. Why I forgive but still only four stars?
Unfortunately, it is not well suited to take it on the road, because these only existing print button can be easily pressed down and then in the "current donation-Mode". Thus, it is for the transport in your pocket, in a backpack or a suitcase conceivable ill suited. I use it to recharge my batteries on a foldable solar panel. Therefore it is well suited. However, one must also look closely here. When the inserted batteries are charged, the red light in the button lights. In case of failure, it flashes red. If the batteries are fully charged it will turn green. At current output it glows blue. In particular, the green and blue lights is just difficult to see, especially in sunlight.
Delivery
The delivery time is a bit longer than usual with Amazon, because the product will be shipped from the UK apparently. Since it is an EU country, you have to calculate any additional costs for customs, but one to two weeks for delivery. For me, it were I think ten days.
Conclusion
A good device that can be addressed, however, due to the peculiarities of a little improved.