[Q]NewTrent Travelpak. Any thoughts?

[tbvnz]

I saw this on Amazon for $25. It looks interesting, Does anyone have any experience or opinions on this device?
NewTrent Travelpak, NT400C Dual USB.
" Dual USB port 5V/2A External Battery Charger with built-in foldable AC Chargers
Charge Apple iPhone 5 up to 2 times
4000mAh capacity with a Dual USB output ports (2A max.)"

http://www.amazon.com/NewTrent-Trav...TF8&colid=24RAMXXLUTZIB&coliid=I2FDR06QR4PS3Z