Sony MDR-DS6500 Mode D'emploi page 22

If an audio signal is not input for about 30 mins
RF signal transmission from the processor automatically stops when an audio signal is not
input for about 30 minutes. When the transmission stops, the processor's power indicator
blinks in green for 30 seconds and then turns off. RF signal transmission may stop when an
extremely low sound is input for about 30 minutes. If this happens, raise the volume of the
connected AV component as high as possible to the extent that the sound is not distorted and
lower the volume of the headphones. If signal noise is output from a component connected to
the AUDIO IN jacks, RF signal transmission may not stop.
If the processor is turned off
The headphones will turned off automatically after 5 minutes. When you want to use the
system again, turn the headphones and processor on.
If you move out from the signal transmission range, the headphones cannot be connected to
the system, and will turn off automatically after 5 minutes.
Note
The processor only works with its supplied headphones.
US
22
Operation