9
3
BASIC OPERATION
3
■ Microphone lock function
The microphone lock function electrically locks [Y] and [Z]
keys on the supplied microphone. This prevents accidental
channel changes and function access.
➥ While pushing and holding [HI/LO] on the microphone,
turn power ON to toggle the Microphone lock function ON
and OFF.
■ Display backlighting
The function display and keys can be backlit for better visibil-
ity under low light conditions.
➥ While pushing and holding [SCAN], push [
YY
] or [
ZZ
] to ad-
just the brightness of the LCD and key backlight.
• The backlight is selectable in 3 levels and OFF.
■ AquaQuake water draining
function
The IC-M304 uses a new technology to clear water away
from the speaker grill: AquaQuake. AquaQuake helps drain
water away from the speaker housing (water that might oth-
erwise muffle the sound coming from the speaker). The IC-
M304 emits a vibrating noise when this function is being
used.
➥ While pushing and holding [Y] and [Z], turn power ON.
• A low beep tone sounds while [Y] or [Z] keys are held to drain
water, regardless of [VOL] control setting.
• The transceiver never accepts a key operation while the
AquaQuake function is activated.
• “ ” scrolls at the channel comment indicator.
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