I am selling my Terrano-X; Helmet-Mounted Headset Bike-to-Bike Radio, Bike-to-Mobile Communication - 2 Unit Set. I've recently updated the wiring (earphones, wires, microphone) so that part is new.
There is nothing wrong with these units. I just bought a newer version because I wanted it and had the spare change.
I will guarantee satisfaction and even install them on your helmet(s) if you want (one time).

They allow you to communicate with another unit (note I'm selling two units) and/or units up to 1500 feet away over flat, open terrain and about 500-600 feet with barriers (hills, trees). You can also listen to music, pair your phone and hear directions, answer and make phone calls (voice activated for the answer part).

They fit on your helmet and can be moved to another helmet if that is needed.

They are EXCELLENT!! I'm selling both for $150. New they would be around $450 (and more) for two.

Call me at 516-526-2495 if interested.
Harvey