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HMEC 400 NoiseGard™ headset
The HMEC 400 differs from the HMEC 300 in the following features:
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Stylish silver design
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Leatherette ear cushions
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Headband padding can be buttoned
HMDC 322 NoiseGard™ headset
The HMDC 322 differs from the HMEC 300 in the following features:
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No Mono/Stereo switch
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Coiled cable
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M-87/AIC dynamic microphone and low impedance headphones
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Connection of headphones and microphone via U-174/U jack plug to a low impedance
interface in the helicopter