Achieve the ultimate in wireless freedom with Sennheiser's ew 172 G4. Using a combination of a compact bodypack transmitter and a reliable rackmountable receiver, the ew 172 G4 system it easy to "plug in" without the hassle of onstage cable tangles. And it sounds great — you get 1,680 tunable UHF frequencies across a 42MHz bandwidth for interference-free reception. Beyond that, the ew 172 G4 is backwards-compatible with previous evolution systems, ensuring that your past investment continues to pay off into the future.