[Fma headset, need help please]

Hi guys 

 

hope someone can help me, I have a Fma rac style headset, I’m running kenwood radios with the correct ptt but when I try and use comms with my fellow team mates they can’t hear me also I can’t hear them through the headset due to it being very quiet, I have changed the battery’s in the headset and change the headset to indoor and listening mode and still have the same problems, could someone please point me in the right direction to fixing this.

 

thanks