1. It does not offer charging over usb, but requires a special charger. 2. It is not stackable to exand the power capacity. 3. There are newer devices on the market which offers these features and more.
1. It does not offer charging over usb, but requires a special charger. 2. It is not stackable to exand the power capacity. 3. There are newer devices on the market which offers these features and more.