The 100mm, black d:fine Core 4188 Directional Miniature Mic Boom from DPA is a replacement microphone boom for the d:fine headset (sold separately). Designed for theater and broadcast applications, the Core 4188 amplifier technology delivers a 14 dB increase in both THD (total harmonic distortion) and dynamic range than the Legacy 4188 model. This miniature mic boom requires an optional cable and headset.