Sony MDR-1RBT - Manual (Page 32)

Communication time (including music playback time) (up to) 30 hours
Standby time (up to) 200 hours
The communication time will be about 15 hours when it is charged for 2 hours.
Time stated above may vary, depending on ambient temperature or conditions of
use.
Checking the remaining battery
If you press the POWER button while the headset is turned on, the indicator (red)
flashes. You can check the remaining battery by the number of times the indicator
(red) flashes. The indicator (red) flashes immediately after the headset is turned on
to indicate the remaining battery power.
Indicator (red) Status
3 times Full
2 times Mid
1 time Low (needs to charge)
Note
You cannot check the remaining battery during pairing operation.
When the battery is almost empty
The indicator turns red. When the battery becomes empty, the headset sounds a
beep and turns off automatically.
Copyright 2012 Sony Corporation
32