Auto standby function
To keep the battery from draining, the headphones automatically turn off after no operations are performed or they are stationary* for at least 10 minutes. The default setting for the auto standby function is “On”.
The headphones are stationary when they have been placed on a surface such as a desk and are completely motionless.
Turning the auto standby function on and off
Slide the NC MODE switch to the left and hold for approximately 5 seconds.
An alert sounds and the auto standby switches between on and off.
When the auto standby function turns on: alert sound 
When the auto standby function turns off: alert sound 
