Sony PlayStation Portable PSP-1007 Instruction Manual page 22

Headphones with remote control
The headphones with remote control are supplied with the Value Pack.
Remote control front
A . button
B > button
C Volume + button
Turns the volume up
D Volume - button
Turns the volume down
E u button
22 Part names and functions
Remote control side
A Hold switch
Locks the operation of the remote
control. Note that this button does
not lock the buttons of the PSP
system.
B Clip
®