Blueooth Headphones Volume Control Problem

[Spike47]

I have a set of Mixcder ShareMe 7 Blueooth Headphones , the problem I have is when I connect them to my Sky+ HD Box via a bluetooth transmitter (via audio phono outputs) I am not able to control the volume from my Headset .
I know the Sky+ HD has a fixed Audio output , but why will my Headphone volume control not work ? .
Cheers
Spike

 

[Spike47]

Hi
Just tried the volume buttons when connected to my iphone , not working with that also ! .

cheers

Spike