I was able to install this on my GMax helmet even though the instructions that came with it are for a different model. The sound is decent and pairing with my phone was flawless. I haven't tried connecting my two sets together yet. The only downside, besides the wrong instructions, is that the mic cable and mic mount are very short. The end of the microphone hits the corner of my mouth squarely. A short cable does not allow for an optimal installation. Since my ski season is 6 months or less, for the money it's not a problem.