Can't hear from the computer speakers - ur12

Hi everybody
I have ur12 connect to my pc with usb (win10)
There are speakers connected to this pc
I connect microphone to the ur12
And i want to hear myself in the speakers when i talk to the microphone
In the pc i configure that the input is the ur12
And the output is the speakers, but no sound from the speakers
If i connect headphones to the ur12 i can hear myself in the headphones, so i know that the microphone is ok.
How i can hear myself in the speakers?
I cant find any application that control the ur12
Thanks a lot!