HARMONY Pro is a completely modular system allowing you to get the most out of a single headset. HARMONY Pro works directly with multiple devices like aviation comm systems, smart phones, and computers. You can go from talking on your smart phone in the terminal (with a great quality noise canceling microphone boom so the other party can actually hear you) to talking on the aircraft radios by only changing the application cable.
The HARMONY Pro is also upgradable and expandable to be compatible with new headsets and applications as they come to market. Upgrade and expansion can be accomplished with minimum cost to the user as parts added or replaced will be compatible with all the other parts of the system, you don't have to replace the entire headset.
HARMONY is made for those who are simply looking for a great headset to be used in only one application and available at a low price. HARMONY has all the same performance and quality of the HARMONY Pro, but without the advanced upgradability and expandability capability.