Close range sounds, wind, and fast movements of the microphone boom, all may cause interfering noises. To avoid these unwanted sounds, windscreen accessories are available. Typically, they are made out of open-cell polyurethane foam. These windscreens do not cause interfering resonances and do not influence the directional pattern. Only in the upper frequency range is the output level slightly attenuated. The wind noise attenuation was measured without electrical filtering in a turbulent air stream traveling at 20 km/h, generated by a noiseless wind machine. Windscreen for RSM 191 A-S. Diameter is approx. 58 mm, length 165 mm. Suppression of the wind noise approx. 10 dB. Attenuation at 15 kHz approx. 2 dB. Color black.