113 BASIC OPERATIONSide tone function■When using a headset (other manufacture’s products), the trans-ceiver outputs your transmitted voice to the headset for mon-itoring. Connect an optional headset to use this function (TheOPC-499 HEADSET ADAPTER and headset are required). (p. 39)D Setting the side tone levelq Push [PTT] to turn the transmit mode ON.w While transmitting, push [Y]/[Z] to adjust the level.• ‘ST--0’ is OFF and ‘ST--10’ is the maximum level.WARNING! NEVER operate the transceiver with a head-set at high volume or monitor levels for a long periodstime. A ringing in your ears may occur. If so, reduce thevolume or monitor level, or discontinue use.LCD backlight■The IC-A14/S has an LCD backlight for convenience duringnight time operation.Push➥ [LIGHT] to turn the LCDbacklight ON or OFF.IMPORTANT!Turn OFF the LCD back-light when no backlight isnecessary.Low battery icon■The low battery icon appears or blinks when the batterypower has decreased to a specifi ed level. The attached bat-tery pack or battery case requires recharging or the batterycase cells need replacing.If the batteries are not charging or replaced, even when thelow battery indicator blinks, a long beep sounds and then thetransceiver will automatically be turned OFF.[PTT][Z]/[Y]Side tone level is indicatedIMPORTANT!Select ‘ST--0’ when a speakermicrophone is connected, oth-erwise your voice will be heardfrom the speaker during trans-mit.[LIGHT]Appears when the batteryis nearly exhausted.Blinks when the batteryrecharging or replacing isimmediately necessary.