Sennheiser HS 2 Instructions For Use Manual page 9

Windshields
Wind noise impairs the quality of outdoor recording and close-miking. The
MZW 2 and MZW 02 windshields considerably reduce the wind noise.
You may further reduce the wind noise
by 10 dB by using the additional
MZW 02 foam windshield.
MZW 2 and MZW 02 are available as
accessories.
HS 2-5 / HS 2-1-5 wiring assignment
Wiring assignment for adaptation to 3.5 mm jack plug or special connector.
Please first use the MZW 2 windshield.
This windshield reduces the wind noise
MZW 2
by approx. 20 dB.
MZW 02
red (signal, +DC)
blue (n.c.)
shield (ground)