cheap option biker to pillion comms?

[bmmonty]

I have a trip coming up with my son as pillion. Would like to have comms between us and want a usable way to do this on the cheap as he dousnt ride pillion very much.

I have a Zumo 660 fitted to.

Any ideas on cheapo system so we can talk to each other?

Thanks

 

[Greg Masters]

 

[bmmonty]

yep

Tried it works well up to 100 mph