I bought a JSP system on Ebay a year or so ago. The best system undoubtedly is from 3M but that is expensive, even for those of us who used to work for them, I tried the Trend system and found the moving forward when you tilt your head to be a problem. The JSP system has the battery separate and you can clip it onto your belt at the back or put it in your pocket. Thus the weight is not in the helmet. To me it is the best compromise . Malcolm.