Overall the design of this is really nice I like the compactness and the one amp charging port.
It looks nice and sleek I like the matte black paint and it fits very nicely in your pocket. I also like the .1 Watt led it is nice and bright adding to the already very useful product. I was able to charge all my mobile devices (iPhone 4, iPhone 6, Galaxy s3, Winbook Tablet, and Bluetooth headphones) that use USB easily so I would see no problem with compatibility of any other devices.
There is a power button on the side that when pressed starts charging the device connected to it and is nothing is connected it shows the percentage of charge at 25% per blue led on the front. When you double press the power button it activates the flashlight, pressing and holding activates a sos sequence from the led light.
One downside is that there is only one USB port, but from a 5200 mAh charger I wouldn’t try charging multiple devices at once anyway.
Heres the link to the product on Amazon: Link