Entertainers, singing dancers, drummers and keyboarders Sports (aerobic instructors) The Opus 54 has been designed for "hands free" applications that require a high quality and lightweight microphone. It is ideal for entertainers, dancers, drummers and keyboard players etc. The Opus 54 will interface with all beyerdynamic wireless systems to provide a low profile neckworn microphone for aerobics instructors, theatre use and stage musicals. Its cardioid polar pattern allows a high gain before feedback, essential when high levels of foldback are used on stage. The Opus 54 features a rugged yet adjustable neckband and flexible ear bows that can be shaped for personal comfort with a secure fit. The Opus 54 is also suited for people who wear glasses.