(1) New FreeMate YHS04 Monaural. FreeMate YHS04 Monaural Noise-Canceling Headset. This FreeMate YHS04 Monaural Noise-Canceling Headset with U10P-S QD Cable is NOT compatible with Cisco 6921, 6941, 7940, 7960, 7970, 8941, 9951 IP Phones.
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