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voice message. To turn the volume off, press the – button

(A:11) for two seconds. This is confirmed by the message

"radio volume off". Press the + button (A:10) to switch this

function back on.

Note! No radio communication can be heard when the

volume is switched off.

Note! When the volume is switched off the other menus will

not be available.

3.5 Channel (radio frequency)

Press the + button (A:10) or – button (A:11) to select bet-

ween eight available channels. Each change is confirmed by

a voice message. See table H Radio channel frequencies.

3.6 VOX (voice-operated transmission)

VOX enables LiteCom to transmit automatically when sound

above a certain level reaches the microphone. This allows

radio transmission without pressing the PTT button (A:14).

Press the + button (A:10) or – button (A:11) to adjust the

sensitivity of voice operated transmission. Each change is

confirmed by a voice message. You can choose between five

levels or switch this function off. When the level is low it is

easier to transmit. To switch this function off, press the – but-

ton (A:11) for two seconds. This is confirmed by the message

"VOX off". The PTT button (A:14) must now be used to

transmit. Press the + button (A:10) to switch this function

back on. Alternatively switch voice-operated transmission on

or off by briefly press the PTT button twice. A voice message

confirms the current VOX setting.

The radio has a Busy Channel Lock Out (BCLO) function that

prevents VOX operation if the channel is being used for other

transmission. An audible tone indicates that the channel is

already being used. Note! To activate the VOX function the

speech microphone (A:8) must be very close to your mouth,

1–3 mm (figure G). The user's voice will be heard in the

headset when the radio is transmitting.

3.7 Squelch (hiss reduction)

"Squelch" means that background hiss in the earphones is

prevented when the incoming signal is below the set squelch

level. Press the + button (A:10) or – button (A:11) to adjust

the squelch level. Each change is confirmed by a voice

message. You can choose between five levels or switch this

function off. A low squelch level may permit longer range.

To switch this function off, press the – button (A:11) for two

seconds. This is confirmed by the message "squelch off".

Press the + button

(A:10) to switch this function back on.

3.8 Sub channel (selective squelch )

Sub channel allows multiple groups of users to use the same

channel without hearing other groups. When sub channel is

active, an inaudible code will be transmitted with speech, and

this code is used to "open" the receiver of other users of the

group. This allows multiple groups of users to use the same

channel without hearing other groups. This product supports

Continuous Tone Coded Squelch System (CTCSS), which me-

ans there are 38 codes which have been assigned the num-

bers 1–38 (table I, CTCSS). All communication on a channel

can be heard if this function is switched off.

Note! When the sub channel function is switched on, all other

incoming radio communication will be blocked. Press the +

button (A:10) or – button (A:11) to select the sub channel.

Each change is confirmed by a voice message. You can

choose between 38 tones or switch this function off. To switch

this function off press the – (A:11) button when sub channel 1

is selected, or press the + (A:10) button when channel 38 is

selected. This is confirmed by the message "sub channel off".

Press the + button (A:10) to switch this function back on.

3.9 PTT (Push-to-talk)

Press and hold the PTT button (A:14) to transmit manually

using the radio. PTT transmission works at any time, regard-

less of BCLO (Busy Channel Lock Out, see 3.6 VOX).

3.10 Reset to factory defaults

To restore the default settings the unit must first be switched

off. Then press and hold the + (A:10) and – (A:11) buttons

at the same time while also pressing the (A:9) On/Off/Mode

button. This is confirmed by the voice message "restore

factory defaults".

4. IMPORTANT USER INFORMATION

Caution! The noise reduction may be lower when eyeglas-

ses, goggles or respirator straps are worn between the

sealing surface of the earmuff cushions and the sides of the

wearer's head. For best noise reduction, select eyeglasses or

goggles that have thin, flat temples or straps which will mini-

mize interference with the seal of the earmuff cushions. Pull

long hair back to the extent possible and remove other items

that may degrade the earmuff seal such as pencils, hats,

jewelry or earbuds. Do not bend and reshape the headband

as this will cause a loose fit and allow sound leakage.

Warning! These hearing protectors help reduce exposure to

hazardous noise and other loud sounds. Misuse or failure to

wear hearing protectors at all times when exposed to hazar-

dous noise may result in hearing loss or injury. This product

contains metallic components that may increase electrical

hazards. For proper use, see supervisor, Fitting Instructions,

or call 3M Technical Service (In U.S.A. call 1-800-243-4630.

In Canada, call 1-800-267-4414)

5. MAINTENANCE (figure J)

5.1 Removing/replacing ear cushions

(J:1) Slide your fingers under the edge of the ear cushion and

pull straight out.

(J:2) Insert a new ear cushion by pressing until it snaps into

place.

5.2 Care and Cleaning Instructions

• Follow recommended care and cleaning instructions in

order to maintain best noise reduction and function.

• Wash outside of earmuffs only. Use mild soap and water.

Do not immerse in water. Remove cushions or liners which

have become damp and allow them to dry before reinstalling.

• Do not clean with solvents such as alcohol or acetone, or