[citation][nom]icepick314[/nom]it's for sharing multiple devices in small confinement...it's not designed as a full-blown home router...I find this kind of device unnecessary if you have any laptops that are only couple years old...most, if not all, new-ish wireless adapters with Windows 7/8 can function as wireless hotspot...search on any search engine for hotspot software and you'll get quite a few results...[/citation]
This is designed as a portable router. People who are on business trips a lot or travel may be staying in a place where they have Ethernet in their hotel room but no WiFi. Plug this into a wall, run an ethernet cable, and BAM! WiFi for your room.
This won't replace your home router. This isn't battery powered and won't pull data from a 3G/4G signal. This is simply a way to make a small hotspot out of an ethernet connection. The fact that it's powered over USB means it can be powered by any USB charger or can act as a USB->Ethernet adapter if it's plugged into a computer.