Today I got the chance to test our duplex communication device. I got from Amazon.com a Scala Rider Q2 Multiset manufactured by Cardo for $250. A really fun thing to have and a must for longer trips. We can now share impressions about scenery, traffic, route and so on. Plus, it plays music/radio (from a stereo jack input), it can be used to control a GPS and it can act as a telephone headset. The Multiset can be used to communicate rider to passenger or between two riders, while the Teamset is a cheaper alternative that permits communication between rider and passenger only.
Whire riding in the mountains, I was able to hear my companion loud and clear when he was even 500m away from me. However, if the peer goes out of sight, the sound quality became poor or is interrupted temporarily. After 1hr charge time we were able to talk almost continuously for 4-5 hours without depleting the accumulators.