I just ordered a set. The Bluetooth with installed connector are in stock and available for immediate shipment. I am hoping they are better than the Bose X I bought last month which have trouble in very noisy cockpit compared to the older Series II which I feel had superior active noise cancllation and very good passive.
The X is a good headset but not in my airplane
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I may have a pair of Bose X (used three times) for sale in a few weeks if these A20 work out.