Sennheiser SH350 Instructions For Use Manual page 7

HMEC 450 NoiseGard™ headset
The HMEC 450 differs from the HMEC 350 in the following features:
• Stylish silver design
• Leatherette ear cushions
• Headband padding can be buttoned
HMDC 372 NoiseGard™ headset
The HMDC 372 differs from the HMEC 350 in the following features:
• No Mono/Stereo switch
• Coiled cable
• M-87/AIC dynamic microphone and low impedance headphones
• Connection of headphones and microphone via U-174/U jack plug to a low impedance
interface in the helicopter
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