What’s unique about the speaker is that it’s the only Pro Sound loudspeaker that can take DC power, i.e. bike power, as an input. Most Pro Sound loudspeakers require AC power. For the Pedal Power world this means you have to use an inverter to turn DC power into AC. But it only gets turned back into DC inside the speaker. Those two conversions aren’t needed with our system, so it runs considerably louder for the same amount of pedaling. Very impressive!