Sony PlayStation Portable Manual De Instrucciones página 14

Outputting audio to external devices
External devices, such as the headphones with remote control (sold separately), can
be used for audio output. Commercially available speakers and headphones (with an
L-type stereo mini plug) can also be used for audio output.
1
Connect the external device to the cradle.
Audio from the PSP™ system is output to the external device.
Example: Connecting to the headphones with remote control
1
Outputting audio to external devices
Video out/headset connector