1) it can charge two batteries at the same time
2) it is not a wall charger like my SONY charger, but it use a USB cord. My SONY charger takes up two slots on the power strip, where as Powerextra battery needs just one USB slot and my power strip has several built-in USB slots, so I gained four outlets as I normally used two SONY chargers side by side.
I appears to charge the batteries in the same amount of time as my OEM charger. However its design fits into my set up much better than the SONY charger. Note: batteries are not included in the package, only the battery charger itself.
You can find it on Amazon by following this link.
Ali Julia review ★★★★★