Hitachi SH-G1000 - Manual (Page 49)

Section 2: Understanding Your Device
41 2A: Your PCS Phone – The Basics
Note: When the Environment switch is set for “Silent,” the volume will be
switched off regardless of the operation of the Volume button. For details
about the Environment switch, see “Environment Switch” on page 42.
Key Guard Switch
Use the Key Guard switch to prevent unintentional operations. This
button is also convenient when using functions (such as music
playback) that do not need the screen.
Turning on the Key Guard switch (up position) places the device into the
following status:
ᮣ Screen: Off
ᮣ The Power button, touch panel, keyboard, jog wheel, and Voice button
will be disabled.
Note: Even when the Key Guard switch is on, the LEDs, Talk button, End
button, Speaker Phone button, Environment switch, Volume button, Reset
button, and Full Reset switch are still available.
ON
OFF
Key Guard Switch