MFJ MFJ-389 User Manual

MFJ-389

Sound Magnifier

Instruction Manual

WARNING: The MFJ-389 Sound

Magnifier is not a hearing aid for those
with impaired hearing. If you have
impaired hearing consult your doctor.

It is important to increase the volume
control very gradually to avoid sudden
increase in sound.

CAUTION

This product is not waterproof.
Therefore, the user must take care to
prevent water from entering the MFJ-389
Sound Magnifier. If water does enter the
MFJ-389, remove the battery and let the
water dry before further use.

ON / OFF SWITCH

The correct positions of the switch are as
shown below:

The switch should be turned to the “OFF”
position when the MFJ-389 is not in use.
This will ensure longer battery life.

VOLUME CONTROL

It is recommended that the volume level
always be started at the minimum level
when the unit is turned on. After turning
ON the MFJ-389, rotate the volume control
upward to increase the volume to a suitable
level. Rotate the volume control downward
to decrease the volume level.

BATTERY INSTALLATION

The MFJ-389 uses one AAA size battery
(not included). To install the battery, open
the battery cover. Insert the battery
according to the polarity marks inside the
battery compartment.

INSTALLING THE EARPHONE

Insert the earphone plug into the jack
on the MFJ-389 as shown below:

INSTRUCTIONS FOR USE

1. Check the battery and earphone to see
that they are properly inserted.

2. Place the earphone of the MFJ-389
Sound Magnifier into your ear, making
sure that the earphone is inserted
deeply into ear canal before switching
the unit on.

3. Turn the switch to the “ON” position
to activate the MFJ-389 Sound
Magnifier. You should hear an air flow
noise.

4. Gradually increase the volume until it
is at a suitable level.

5. One the volume level is set, place the
MFJ-389 Sound Magnifier on your
belt or in your shirt pocket.

6. Use the MFJ-389 Sound Magnifier
only when situations which require
amplification of sounds, such as
movies and television. The MFJ-389
Sound Magnifier is not intended to be
worn for more than several hours at a
time.

7. Excessive use will drain the batteries.
Turn the MFJ-389 Sound Magnifier
OFF when not in use.

12 MONTH LIMITED WARRANTY

nc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc.

The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit

card or money order receipt, etc.) describing the product to establish the validity of the
warranty claim and submit the original or machine reproduction of such proof-of-purchase
to MFJ Enterprises, Inc. at the time of warranty service. MFJ Enterprises, Inc. shall have
the discretion to deny warranty without dated proof-of-purchase. Any evidence of
alteration, erasure, or forgery shall be cause to void any and all warranty terms immediately.

MFJ Enterprises, Inc. agrees to repair or replace at MFJ’s option without charge to the

original owner any defective product under warranty, provided the product is returned
postage prepaid to MFJ Enterprises, Inc. with a personal check, cashiers check, or money
order for $7.00 covering postage and handling.

MFJ Enterprises, Inc. will supply replacement parts free of charge for any MFJ product

under warranty upon request. A dated proof-of-purchase and a $5.00 personal check,
cashiers check, or money order must be provided to cover postage and handling.

This warranty is NOT void for owners who attempt to repair defective units. Technical

consultation is available by calling [phone].

This warranty does not apply to kits sold by or manufactured by MFJ Enterprises, Inc.

Wired and tested PC board products are covered by this warranty provided only the wired

and tested PC board product is returned. Wired and tested PC boards installed in the
owner’s cabinet or connected to switches, jacks, or cables, etc. sent to MFJ Enterprises,
Inc. will be returned at the owner’s expense unrepaired.

Under no circumstances is MFJ Enterprises, Inc. liable for consequential damages to person

or property by the use of any MFJ products.

Out-of-warranty Service: MFJ Enterprises, Inc. will repair any out-of-warranty product

provided the unit is shipped prepaid. All repaired units will be shipped COD to the owner.
Repair charges will be added to the COD fee unless other arrangements are made.

This warranty is given in lieu of any other warranty expressed or implied.

MFJ Enterprises, Inc. reserves the right to make changes or improvements in design or

manufacture without incurring any obligation to install such changes upon any of the
products previously manufactured.