The SHURE's WH20-QTR has a secure fit for active microphone users with minimal visibility for stage appearances, such as aerobics instructors and musicians. This dynamic microphone provides high-quality voice pickup in a durable, lightweight package. The cardioid (unidirectional) pickup design gives more gain-before-feedback and separation from undesired sound sources such as ambient noise. To compensate for the proximity effect inherent in cardioid mics during close-talk operation, a carefully tailored frequency response features a voice-frequency presence peak and a low-frequency roll-off.