Default [Q] xiaomi pistone v2 - vol +/- not work

Hello

I have recieved today the xiaomi pistone v2 earphones.
I plug it to my Moto G and the vol +/- buttons on the earphones does not work. Rest is working fine.

Moto G does not support this vol +/- control via earphone or is it because of the earphones ?

dose anyone know this topic ?