The HS-11 is a lightweight and unobtrusive headworn microphone, featuring a uni-directional (cardioid) polar pattern. This cardioid pattern is crucial as it minimizes the pickup of ambient noise and feedback from the sides and rear of the microphone, focusing instead on capturing the speaker's voice clearly. The electret condenser element ensures high-quality sound reproduction across a frequency response of 30-18,000 Hz, with a sensitivity of -48dB and an impedance of 680 ohms.