Portable Headphone Amp with Wall Charger

the Oppo looks very interesting.  How do I charge it if I do not have a computer? Thanks 

It comes with a wall charger (micro USB type).  You can charge it with any phone (micro USB) wall charger, but one provided is recognized by the unit as rapid charger and charges much faster (if it makes any difference).

thanks much

Jl35, try to google "Oppo HA-2" and "HD700" or "HD-700".  You might find additional info on the use with Senheissers.

You should check out the Fiio E12, a true giant-killer!