This boom is part of the modular d: fine 4166 Slim Omnidirectional (Ball) Headset...
This boom is part of the modular d: fine 4166 Slim Omnidirectional (Ball) Headset Microphone. The directional characteristic of the microphone is marked on the flat microphone head with an O for omnidirectional (sphere). This marking should always point towards the mouth.
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