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Buy an official AC attenuation cable to enable fine-grained microphone adjustments and improve the audio quality of your calls. Jabra GN1218 has 8 settings to easily adjust the sound levels. GN1218 is compatible with Jabra BIZ 1500, 2300, and 2400II headsets. It works with Cisco 7800-Series and 8800-Series IP phones, as well as most standard telephones. The cable is 2m long and is coiled.