BenQ Z2 - Manual (Page 138)

122 Menus
Auto Keypad Lock
Used to set up a keypad lock. When you have not used the keypad
for a specified period of time, the keypad will be locked.
To set the status On, push the Joystick right or left. Then you can set
the time duration of inactivity before the phone activates the
keypad lock.
Power Saving Mode
Activating this mode will reduce the brightness of the keypad and
display backlighting in order to conserve battery power.
Language
Used to select the language that the phone will use.
Input
You can set up the list of available input modes and then choose the
default input mode to enter text.
Restore
Restores all the settings to their factory defaults.