Talking while you ride.

The intercom has the highest contagion rate of any accessory: one person in the group has one, two weeks later everybody does. That is why this category sells through a demonstration, not through a catalogue.

Mesh is the argument. Unlike Bluetooth the connection does not drop when someone falls behind, and the group does not have to pair again. Nobody who has experienced that goes back.

The range runs from an entry-level unit to the models with Bose tuning and a built-in camera, plus units prepared for particular helmets.

And it runs further than you would think: speakers, microphones, cables, mounts and chargers are listed at the bottom of this page. That is the depth a dealer needs when a customer walks in with a three-year-old unit.