The answer from the Sony rep above is misleading. I bought these ‘phones last night and downloaded the app. The “standby mode” field does not allow or prevent the headphones from turning off after five minutes if not connected to BT or a wired connection; to me it seems to do nothing. When I disconnected BT on my phone, five minutes late the ‘phones turned off regardless of the state of that setting in the app.
I have a very hard time with the concept of a wireless noise canceling device that MUST be connected to continue working. As a traveling professional who frequently flies internationally, I want a noise canceling set that allows me to cancel noise but not be connected to anything else while I try to sleep. These ‘phones do not do the job. I returned the ‘phones just now. Sony won’t get my business unless they come out with a fix.