MONAURAL HEADSET 200 OHMS
https://www.wce-electronics.es/shop/11490-monaural-headset-200-ohms-1134
https://www.wce-electronics.es/web/image/product.template/1134/image_1920?unique=001ad14
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Headphones 400 ohms and microphone 200 ohms military applications
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