BKey - external size of a key fob battery for emergencies

Due to the constant paranoia on the subject, that the iPhone runs out, I turned off the display of interest. So much to worry about the battery is abnormal devaysa, and I'm sure I'm not the only one doing such idiocy. However, sometimes iPhone does not "survive" some twenty or thirty minutes, and when it is really needed, in my hand already useless piece of plastic and iron. bKey - a small battery that is attached to the keys and provides the extra half hour.

Dimensions bKey - 48 mm in length, 14 mm in width and 4 mm in thickness. It very little power - only 350 mAh. However, to ensure a full charge iPhone several times you probably have large external batteries. bKey needed for other purposes.

The device hangs on the keys or backpack - that is always with you. Due to the fact that he holds a 100% charge for a month, you can forget about it and remember only when the iPhone is turned off at the wrong time.

350 mAh for long enough, you yourself understand this. According to the developers, it is 30 minutes of talk time. But in an emergency, and no more, given that bKey very small and it is difficult to pay attention to the point where it is useful.

The battery is available in two colors - black rubberized and glossy white. It seems, the device cost would be less. one bKey It costs $ 29.99. In fact, for the same money you can buy on the Xiaomi PowerBank 16,000 mAh. But here you need to start from their own purposes. Do you want to wear a big battery if your task - to ensure the iPhone to charge extra 15-20 minutes?