I tried it with a colleagues Pro Flight and the Bluetooth didn’t bleep by disconnecting every 40 seconds and reconnect when not in use. Contacted Bose and sent them back recently for a replacement headset.
In the meantime I’ve got my A20’s out of retirement and what a difference. I immediately felt the clamping on my head from the A20’s that never bothered me before but more importantly, I felt completely disconnected from the aircraft, couldn’t hear the engines at all and didn’t like them one bit. My ears got used to it after a few days and retuned but it was like the first time I tried the A20 from my previous ANR headset.
The A20 is brilliant but having gone back to them from the Pro Flight whilst I wait my replacement, I do feel the A20’s are just too aggressive for jet aircraft with the ANR. Think the Pro Flight is just about right. A20 for GA and turboprops and Pro Flight for the jet flight deck.