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David Clark H10-20 upgraded to ANC.

David Clark H10-20 aviation headset, converted to ANC by a qualified avionics technician probably ten years ago. This headset has served me very well and without any issues for many years. It is in excellent condition and has been very well looked after. It runs on one flat 9v cell and normally goes in excess of ten hours before the ANC stops. When that happens, the headset continues to operate but without the ANC. New foam microphone glove included.