Monaural Standard microphone headset ** FOR IP TELEPHONY USE ONLY** The GN 2010 ST features a standard microphone, together with the industry's first flexible SoundTube which lets you precisely position the boom for optimal voice pickup. -Flex boom with noise-canceling microphone Reduces unwanted background noise for better communication. -Less room noise also suggests individualized service. -Durable design with all metal boom pivot. -Large, pivoting ear cushions, in pillow-soft foam. -Rich, wideband sound: 150-6800 Hz range. -Only commercial headsets to meet TIA-920 VoIP standard for true wideband response.