The HMD25-1 from Sennheiser is a trusted industry standard headset, great for sports broadcasts. A lightweight, padded, split headband with dynamic, closed headphones combined with a quality super-cardioid close-contact dynamic mic, the HMD25-1 can't be beat in noisy environments. Headphone frequency response 20 Hz-16 kHz; impedance 600 ohms. Microphone frequency response; 100 Hz-16 kHz; 1 mV/Pa sensitivity; right or left-side positioning of mic. Cable is unterminated.