How do i get the usb dac to work?

I wanna ask some question: 1)how to change to english language 2)Does the battery need priming?

anyway guys thanks for the input,Gonna get probably the x7 

zx2 out of my budget hahaha college student on a tight budget

Thanks,looks like my decision was right probably gonna get x7 

Looking for: Warm,organic sound signature Soundstage Good Vocals Streaming services(Definitely a must)   Gonna pair it with iem mostly (Sony XBA-A3) (Thinksound On1)   I Really appreciate your opinion doesnt matter if youu audition a short your opinion is greatly appreciated

What would be a good pads for these?or any headphones pads that i can use to replace the pads.The pads spoil easily

How about adding in acoustic research m2

Patnering with xba a3 currently and in the future probably A dulce bass or savant(this will be my endgame portable set up)i will be getting this at ard 800usd versus the onkyo ard this price range

How do these compare to acoustic research m2

Urgent!!!this or dp x1

Does anyone know whether beyerdynamic pads from dt1350 or t51i fits these? 

Mdr 1ABT