The tube is made of metal, with two USB ports on one side. Light enough, he knows how to be discreet.
To charge your phone, connect the battery to your phone, that's all. The battery heats up during charging the phone, but it's still okay.
What I liked about this product:
- Battery comes charged and ready for use.
- The supplied cable is multi-connectors: mini-USB, micro USB and iPhone.
- If simply connects to a standard USB plug to charge (220v PC or phone charger).
What could be improved:
- The inputs and outputs are very close, you can not connect the battery to a power source and a phone together.
- No instructions in the box (the operation is simple, but still, no warning message on the charging time, the possibility of charging the battery and phone at the same time ...)
- Add a light to indicate the battery charge level (eg charge, discharge, charge 100% and insufficient load ...)
In summary, for the price, it's a good little product.
