I came across this co. on Youtube "domiosports.com" so looked into it a bit. It's worth a look if you like your comms and music whilst riding.
It works on micro vibrations through the helmet, so no wires inside, all bluetooth connectivity, allegedly 24 hr use from a charge and the Pro+ (they have run out of the original) comes with an "Air mic". So you can speak to another Pro+ user or answer phone calls etc. They both clip on the outside of the helmet. So no wires or speakers digging into your ears. Current offer through indiegogo has the Pro+ and the air mic plus a spair set of attachment clips so you can transfer to another helmet at £129 free delivery (37% off if memory serves.)
The only thing else on the market is the Headwave Tag which is music only but works also on the microvibe principle
It works on micro vibrations through the helmet, so no wires inside, all bluetooth connectivity, allegedly 24 hr use from a charge and the Pro+ (they have run out of the original) comes with an "Air mic". So you can speak to another Pro+ user or answer phone calls etc. They both clip on the outside of the helmet. So no wires or speakers digging into your ears. Current offer through indiegogo has the Pro+ and the air mic plus a spair set of attachment clips so you can transfer to another helmet at £129 free delivery (37% off if memory serves.)
The only thing else on the market is the Headwave Tag which is music only but works also on the microvibe principle