Sony PSP-1006 K - Manual (Page 22)

22 Part names and functions
Headphones with remote control
A . button
B > button
C Volume + button
Turns the volume up
D Volume - button
Turns the volume down
E u button
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
VO
L
Remote control side Remote control front