I have tested many in ear monitor (IEM) monitor systems and the Listener Pro IEMs are unique in a few important ways. 1. It is super easy to setup and sync channels, with a good number of channels to choose from. 2. Both units can act as a receiver or a transmitter with a flip of a switch. 3. They can be used as an instrument wireless transmitter, and a speaker wireless transmitter, so it is versatile for many situations. 4. It's about the size of a cell phone and easily fits in the pocket. 5. Optional stick on belt clip that also can be used as to attache to a tripod if needed. They sound really good too, but there was a slight delay that I detected. I would guess 5-10ms, which is to be expected. It is not enough delay to be a deal breaker though.
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