Motorola solutions PMMN4128 Quick Start Manual Download Page 1

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Foreword
RF Energy Exposure and Product Safety 
Guide for Portable Two-way Radios

Attention!

Before using this accessory, read this guide 
which contains important operating instructions 
for safe usage and RF energy awareness and 
control for compliance with applicable standards 
and regulations.
The Remote Speaker Microphone (RSM), when 
attached to the radio, is restricted to occupational 
use only to satisfy FCC/ICNIRP RF energy 
exposure requirements. Before using this 
product, read the RF energy awareness 
information and operating instructions in the 
Product Safety and RF Exposure booklet 
enclosed with your radio to ensure compliance 
with RF energy exposure limits.

Acoustic Safety

Exposure to loud noises from any source for 
extended periods of time may temporarily or 
permanently affect your hearing. The louder the 
volume of the radio, the less time is required 
before your hearing can be affected. 

Hearing damage from loud noise is sometimes 
undetectable at first and can have a cumulative 
effect.

To protect your hearing:

• Use the lowest volume necessary to do your 

job. 

• Turn up the volume only if you are in noisy 

surroundings. 

• Turn down the volume before attaching 

headset or earpiece.

• Limit the amount of time you use headsets or 

earpieces at high volume.

• When using the radio without a headset or 

earpiece, do not place the speaker of the radio 
directly against your ear.

• If you experience hearing discomfort, ringing in 

your ears, or muffled speech, you should stop 
listening to your radio through your headset or 
earpiece, and have your hearing checked by 
your doctor. To change the volume level, refer 
to Radio Product Safety Leaflet or CPS for 
Surveillance extra loud (xL) Kit Configurations.

RSM Features

PMMN4128

RM780 IMPRES Windporting Remote 

Speaker Microphone, Large (IP68)

*MN006621A01*

MN006621A01-AB

MOTOROLA, MOTO, MOTOROLA SOLUTIONS 
and the Stylized M logo are trademarks or 
registered trademarks of Motorola Trademark 
Holdings, LLC and are used under license. All 
other trademarks are the property of their 
respective owners.
© 2020 Motorola Solutions, Inc. All rights 
reserved. 
EU Contact: Motorola Solutions, Czerwone Maki 
82, 30-392 Krakow, Poland.

Printed In

 

Table 1: RSM Features

No.

Description

1

Push-to-Talk Button

2

 1-Dot Button* 

2-Dot Button*

3

+  Volume  Up

4

-  Volume  Down

1

2

3

4

5

6

Recommended Practice

• Cover the audio jack with dust cover when it is 

not plugged with earpiece.

• Do not fill water into the audio jack.
• If water enters the audio jack, remove water by 

shaking the RSM.

Transmitting and Receiving

Recommended RSM Wearing Position

Attaching the RSM to the Radio

Attach the RSM connector to the side connector 
of the radio. Then secure the connection screw in 
a clockwise direction until tightened.

Note:

To ensure proper operation, turn off the radio 

before connecting the RSM to the radio.
Connecting the RSM to the radio disables the 
speaker of the radio, but does not disable the 
microphone and PTT of the radio. 

Detaching the RSM from the Radio

1.

Unscrew and detach the RSM connector 
from the radio side connector.

2.

Keep the dust cover inserted in the audio 
jack of the RSM when a secondary acces-
sory is not being used.

5

Accessory Orange/Emergency Button*

6

Receive-only 3.5 mm Audio Jack 

(Non-threaded) covered by Dust Cover

* Check with your dealer for available 

programmable functions.

Table 1: RSM Features

No.

Description

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