Motorola GM950 is a versatile handheld communication device that offers a range of features to enhance your business operations. With its compact and ergonomic design, it provides reliable and efficient communication on the go. Here are some key capabilities of your new Motorola GM950:
-
Seamless Connectivity: Stay connected with your team and respond promptly to customer needs with the GM950's high-quality voice communication.
-
Clear Audio: Experience crisp and clear audio during calls, ensuring effective and efficient communication, even in noisy environments.
-
Durability: Built to withstand the demands of everyday use, the GM950 features a robust construction that can endure accidental drops and exposure to harsh conditions.
Motorola GM950 is a versatile handheld communication device that offers a range of features to enhance your business operations. With its compact and ergonomic design, it provides reliable and efficient communication on the go. Here are some key capabilities of your new Motorola GM950:
-
Seamless Connectivity: Stay connected with your team and respond promptly to customer needs with the GM950's high-quality voice communication.
-
Clear Audio: Experience crisp and clear audio during calls, ensuring effective and efficient communication, even in noisy environments.
-
Durability: Built to withstand the demands of everyday use, the GM950 features a robust construction that can endure accidental drops and exposure to harsh conditions.
Control Heads/Control Microphones Specific Information 4-i
Chapter 4
Control Heads/Control Microphones
Specific Information
Table of Contents
Table of Contents
Chapter Page
4A Control Head for Radio Model N2 ........................................................ 4A.1-i
4B Control Head for Radio Model N3......................................................... 4B.1-i
4C Hand Held Control Microphone GMN6151...........................................4C.1-i
4D Control Head for Radio Model N4.........................................................4D.1-i
Table of Contents
4-ii Control Heads/Control Microphones Specific Information
Hand Held Control Microphone GMN6151 4C-i
Chapter 4C
Hand Held Control Microphone GMN6151
Table of Contents
Table of Contents
Chapter
4C.1 Introduction/Theory of Operation
4C.2 PCB/Schematic Diagram and Parts List
Table of Contents
4C-ii Hand Held Control Microphone GMN6151
Introduction/Theory of Operation 4C.1-i
Chapter 4C.1
Introduction/Theory of Operation
Table of Contents
Table of Contents
Paragraph Page
1.0 Overview..................................................................................................... 1
2.0 Mechanical Parts List.................................................................................1
3.0 Theory of Operation .................................................................................. 2
3.1 General........................................................................................................ 2
3.2 Power Supplies............................................................................................ 2
3.3 Power On / Off............................................................................................. 2
3.4 PTT Button................................................................................................... 2
3.5 ON/OFF Hook Control................................................................................. 2
3.6 Keypad and Top Keys ................................................................................. 3
3.7 Switch Functions.......................................................................................... 3
3.8 Status LED and Back Light Circuit............................................................... 3
3.9 Liquid Crystal Display (LCD)........................................................................ 4
3.10 Microphone Amplifier................................................................................... 4
3.11 Speaker ........................................................................................................4
3.12 Connections to the Radio ............................................................................ 4
3.13 Electrostatic Transient Protection................................................................ 5
3.14 Jumper Functions........................................................................................ 5
Table of Contents
4C.1-ii Introduction/Theory of Operation
Overview
Introduction/Theory of Operation 4C.1-1
1.0 Overview
Hand Held Control Microphone GMN6151
The features of the Hand Held Control Microphone are as
follows:
■
■■
On/Off Button
■
■■
Rocker Type Volume Up/Down Control
■
■■
Rocker Type Scroll Up/Down Control
■
■■
3 digit, 7 segment Backlit LCD display
■
■■
8 LCD Annunciators/Icons
■
■■
3 LEDs (Red, Yellow, Green)
■
■■
7 Dealer Programmable Option Buttons
2.0 Mechanical Parts List
GMN6151A Hand Held Control Mic
HLN9073B Hang-up Clip
AHN6050A HSG ASSY SPI
GLN7338A HH CONTROL MIC PCB
0102725B82 LCD GM950
7586044B02 Keypad code GM950
0102725B83 FRONT HSG
0102708D08 ASSY MIC
0102708D07 ASSY SPEAKER
3386016B03 Nameplate (GMN6151A)
5680918X03 CNT BOX
0102725B82 HHCM LCD GM950
1305844X01 Bezel LCD
2805397L10 Conn. Elastomer
3205157Y01 Gasket Lens
6105842X01 Lightpipe LCD
9105447Y01 Filter Display
5408344X01 40mm x 8 mm Label
7202698Y01 LCD GM950
AHN6050A HSG ASSY SPI HHCM
1105760Y01 Adhes. Cable Retainer
1505892Y01 Cover,rear
3005153Y06 Cable Coil
3205082E93 Gskt. O-Ring, main
4205158Y01 Retainer Cord
4205343Y01 Retainer
4C
.
1
GMN6151
(GM950)
0102725B83 HHCM FRONT HSG
1505891Y02 Housing
3305409X08 LLBL Nameplate
3505671Y01 Grillcloth
3805835X01 Button PTT
4505850X01 Lever PTT
7505618V02 Keypad PTT
0102708D08 ASSY MIC
3005637Y01 Cable Mic
5013920A01 Microphone Mini Elecret
0102708D07 ASSY SPEAKER
3005637Y01 Cable Mic
5005213W01 Speaker
7505581W02 Pad Speaker
Theory of Operation
4C.1-2 Introduction/Theory of Operation
3.0 Theory of Operation
3.1 General
The Control Microphone contains the speaker, the microphone, several buttons to operate the radio,
several indicator Light Emitting Diodes (LED) to inform the user about the radio status and a 3 digit /
7 segment Liquid Crystal Display (LCD) for nummerical information e.g. channel number, select
code.
3.2 Power Supplies
The power supply to the HHCM is taken from the host radio’s FLT A+ voltage via connector J0901
pin 8. This voltage is at battery level and is used for the voltage regulator (U0971), the LEDs, the
back light and to power up the radio via the On / Off button. The voltage regulator (U0971) provides
the stabilized 5 volt source for the display, the display driver, the shiftregister and the keypad buttons.
The regulated output of U0971 is enabled by a low state and disabled by a high state at pin 3 to
switch the HHCM circuits on and off. Input and output capacitors (C0972 and C0975, C0976) are
used to reduce high frequency noise and provide proper operation during battery transients.
3.3 Power On / Off
The On/Off button when pressed switches the radio’s voltage regulators on by pulling ON OFF
CONTROL to high via D0971 and connects the base of Q0971 to FLT A+. This transistor pulls the
line ANALOG 3 to low to inform the µP that the On/Off button is pressed. If the radio is switched off,
the µP will switch it on and vice versa. If the On/Off button is pressed and held while the radio is on,
the software detects a low state on line ANALOG 3 and switches the radio off.
While the radio is switched on, the radio’s controller enables the regulated output pin 1 of U0971 by
setting line LED CE to high and in turn pulling input U0971-3 to ground by transistor Q0972. Line
LED CE is also used to write data into the shiftregister U0983. After the serial write process line LED
CE is set to low for a few microseconds to update the output of the shiftregister with the new data.
The low - pass filtering provided by C0973 and R0974 filters out these small low periods and
prevents disabling of the voltage regulator output.
3.4 PTT Button
The PTT function is achieved by pressing button PB0901 which places a low on the PTT line to the
radio, causing the radio to transmit.
3.5 ON/OFF Hook Control
When the HHCM is off-hook the monitor input (line HOOK; J0901-9) to the radio is open circuit.
When the HHCM is placed on-hook the hang up clip shorts the TP0901 and TP0902 terminals which
takes the monitor input to ground, indicating to the radio that the microphone is on-hook. Diode
VR0922 and C0922, C0923 provide Electro Static Discharge (ESD) and Radio Frequency
Interference (RFI) protection.
Theory of Operation
Introduction/Theory of Operation 4C.1-3
3.6 Keypad and Top Keys
The HHCM keypad has 10 keys, plus 3 additional keys, the on/off key being one of them, which are
located on the top of the HHCM.
All keys are configured as 3 analogue lines (ANALOG 1 2 3) to the radio. Each of the lines controls
four keys; line ANALOG 3 additionally controls the on / off key. The voltage on the analogue lines
varies between 0V and +5V depending on which key has been pressed. If a button is pressed, it will
connect one of the 3 lines ANALOG 1,2,3 to a resistive voltage divider connected to +5V. The
voltages of these lines are A/D converted inside the µP and specify the pressed button.
3.7 Switch Functions
Ten of the switches (PB0931 - PB0934, PB0941 - PB0944, PB0953, PB0954) are the keypad
switches. The remaining 3 Top Key switches (PB0951, PB0952, PB0971) and the PTT switch
(PB0901) are simple contact closure switches. The switches and their functions are detailed below:
Switch Type Function
PB0901 Contact PTT
PB0931 Keypad Configurable
PB0932 Keypad Configurable
PB0933 Keypad Configurable
PB0934 Keypad Configurable
PB0941 Keypad Volume Down
PB0942 Keypad Volume Up
PB0943 Keypad Configurable
PB0944 Keypad Configurable
PB0951 Contact Configurable
PB0952 Contact Configurable
PB0953 Keypad Scroll Down
PB0954 Keypad Scroll Up
PB0971 Contact Power ON/OFF
3.8 Status LED and Back Light Circuit
All the indicator LEDs (3) and the back light LEDs (10) are driven by current sources Q0982 - Q0986
and controlled by the µP via SERIAL PERIPHERAL INTERFACE (SPI). The current is determined
by the resistor at the emitter of the respective current source transistor. Shiftregister U0983 stores
the LED status. To update the LED status line LED CLCK BUF shifts the data of line SPI DATA BUF
into the shiftregister. When all the data has been written, line LED CE is set to low for a few
microseconds to update the output of the shiftregister with the new data.
The green (D0983), red (D0982) and yellow (D0981) indicator LEDs are covered by the LCD display.
If a LED is switched on, the corresponding area of the LCD display is switched to transparent by the
respective shiftregister output using Exclusive-OR (XOR) gate U0982-1-4 and the backplane signal
from the LCD driver U0981 pin 26, 27.
The squarewave backplane signal from U0981 is buffered by XOR gate U0982-1 and then fed to one
of each inputs of the three remaining XOR gates. The output of these gates is the inverted
backplane signal, while the connected output of the shiftregister is high, and non-inverted while it is
low. The inverted backplane signal fed to the respective LCD input makes the corresponding area
transparent for the covered LED, while a non - inverted backplane signal makes it non-transparent.
Theory of Operation
4C.1-4 Introduction/Theory of Operation
3.9 Liquid Crystal Display (LCD)
The LCD display H0931 is a 3 digit / 7 segment display which incorporates 11 annunciators. Data is
loaded serially into the display driver U0932 via the SPI interface. The display data of line SPI DATA
BUF is shifted serially by clock signal LCD CLCK BUF. When the last bit has been received, the LCD
display is updated.
3.10 Microphone Amplifier
The microphone cartridge contains a capacitive transducer coupled to a FET amplifier. The
microphone’s audio signal is fed from the microphone inputs, MIC+ and MIC-, at J0903 to the
microphone amplifier. The microphone amplifier sets the frequency response and amplifies the
audio signal to the required radio input level (about 80mV at nominal sound pressure level). The first
stage (Q0902) connected to the microphone is an active high-pass filter which suppresses
frequency components below 300 Hz to prevent PL falsing in a receiving radio. The collector current
of Q0902, drawn from the collector of the following stage Q0901, is approximately 0.27 mA. A low-
pass filter composed of R0904 and C0907, C0908 filters out any audio frequency components riding
on this voltage. The output of the first stage is fed via R0906 to the second stage (Q0901) which
amplifies the audio signal to the radio’s input level. The supply voltage of the stage is provided by the
radio’s 9V3 voltage regulator via the load resistor (1kΩ) located on the radio’s controller section, line
MIC and connector J0901 pin 4. Q0901 draws a collector current of 2 mA. The collector AC current
of Q0901 causes a voltage drop across the load resistor representing the audio signal from the
microphone.
3.11 Speaker
The HHCM contains a speaker for the receiver audio. The receiver audio signal from the differential
audio output of the audio amplifier located on the radio’s controller is fed via lines INT SPKR+, INT
SPKR-, connector J0901-12,10 and parallel resistors R0921 - R0923 to the speaker connector
J0902 pin 1 and pin 2. The speaker is connected to the connector J0902. Resistors R0921 - R0923
reduce the audio power applied to the speaker to prevent overloading.
3.12 Connections to the Radio
Interconnections between the HHCM and the host radio are via an expanding cable which is
permanently connected to the HHCM. The cable has an 18 pin Molex connector which connects to
connector P0951 in the blank head of the host radio. P0951 is mounted on an adapter PCB. After
additional filtering the signals are fed to the host radio’s main PCB via connector J0950, also located
on the adapter PCB, a flexible ribbon cable and connector J0101. The connections between the
PCB in the HHCM and the main PCB in the radio are shown in the following table:
Theory of Operation
Introduction/Theory of Operation 4C.1-5
3.13 Electrostatic Transient Protection
Electrostatic transient protection is provided for the sensitive components in the HHCM by diodes
VR0901, VR0921, VR0922, VR0924 - VR0929. The diodes limit any transient voltages to tolerable
levels. The associated capacitors provide Radio Frequency Interference (RFI) protection.
3.14 Jumper Functions
The jumpers are used to adapt the function of the keypad buttons for different keypads.
Radio Adapter PCB Cable HHCM Description
J0101 J0950 P0951 Connector J0951
1 18 18 1 12 INT SPKR+
2 17 17 2 10 INT SPKR-
13 6 16 3 2 ANALOG 3
4 15 15 4 3 PTT
10 9 9 10 13 ANALOG 1
11 8 8 11 11 ANALOG 2
17 2 4 15 8 FLT A+
18 1 1 18 14 ON OFF CONTROL
8 11 14 5 5 LCD CLCK BUF
6 13 13 6 6 SPI DATA BUF
5 14 3 16 15 LED CLCK BUF
7 12 12 7 1 GND
16 3 10 9 4 MIC
3 16 6 13 9 HOOK
12 7 7 12 7 LED CE
Theory of Operation
4C.1-6 Introduction/Theory of Operation
PCB/Schematic Diagram and Parts List 4C.2-i
Chapter 4C.2
PCB/Schematic Diagram and Parts List
Table of Contents
Table of Contents
Description Page
HHCM GMN6151 - Diagrams and Parts Lists
PCB Layout Component Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
PCB Layout Solder Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table of Contents
4C.2-ii PCB/Schematic Diagram and Parts List
Hand Held Control Microphone GMN6151 PCB No. 8402694Y03_T1
Diagrams and Parts List 4C.2-1
Hand Held Control Microphone GMN6151
PCB No. 8402694Y03_T1
C0901
C0902
C0903
C0904
C0905
C0906
C0907
C0908
C0909
C0910
C0911
C0912
C0913
C0920
C0921
C0922
C0923
C0924
C0925
C0926
C0927
C0928
C0929
C0931
C0941
C0951
C0971
C0972
C0973
C0974
C0975
C0976
C0981
C0982
C0983
C0984
C0985
D0971
J0901
J0902
J0903
PB0901
PB0951 PB0952 PB0971
Q0901
Q0902
Q0971
Q0972
Q0981
Q0982
Q0983
Q0984
Q0985
Q0986
R0901
R0902
R0903
R0904
R0906
R0907
R0908
R0909
R0910
R0911
R0912
R0913
R0921
R0922
R0923
R0935
R0936
R0937
R0938
R0945
R0946
R0947
R0948
R0951
R0952
R0953
R0954
R0955
R0956R0957
R0958
R0959
R0960
R0961
R0962
R0964
R0966
R0971
R0972
R0973
R0974
R0981
R0982
R0983
R0984
R0985
R0986
R0987
R0988
R0989
R0990
R0991
R0992
R0993
R0994
R0995
R0996
R0997
R0998
R0999
U0971
U0981
U0982
U0983
VR0901
VR0921
VR0922
VR0924
VR0925
VR0926
VR0927 VR0928
VR0929
1
44
40
39
29
28
18
177
6
1
15
LS
MIC
Solder Side 8402694Y03 GEPD5518-1
Bottom Side
121
22
42
PB0944
PB0931 PB0932
PB0943
PB0933 PB0934
PB0942 PB0954
PB0941 PB0953
JU0951
JU0954
JU0956
JU0955
JU0960
JU0957
JU0958
JU0959
D0981
D0982
D0983
D0990 D0991
D0992 D0993
H0901
D0984
D0985
D0986
D0987
D0988
D0989
JU0953
JU0952
Component Side 8402694Y03 GEPD5517-1
Top Side
Hand Held Control Microphone GMN6151 PCB No. 8402694Y03_T1
4C.2-2 Diagrams and Parts List
Hand Held Control Microphone GMN6151 Schematic Diagram
Diagrams and Parts List 4C.2-3
Hand Held Control Microphone GMN6151 Schematic Diagram
GEPD5516-1
6.42V
5.9V 5.56V
3.23V
5.48V
3.24V
Hand Held Control Microphone GMN6151 Schematic Diagram
4C.2-4 Diagrams and Parts List
Hand Held Control Microphone
Parts List
Circuit
Ref
Motorola
Part No.
Descritpion
C0901 2113741F17 470pF 50V
C0903 2113743A19 100nF 16V
C0904 2113741F25 1nF 50V
C0905 2113741F25 1nF 50V
C0906 2311049A63 TANT CP 10uF 10% 10V
C0907 2311049A63 TANT CP 10uF 10% 10V
C0908 2113741F25 1nF 50V
C0909 2113741F25 1nF 50V
C0910 2113741F49 10nF 50V
C0911 2113743K07 47nF 16V Y5V
C0912 2113741F25 1nF 50V
C0913 2113740F36 24pF 5% 50V
C0920 2113741F17 470pF 50V
C0921 2113741F25 1nF 50V
C0922 2113743A19 100nF 16V
C0923 2113741F17 470pF 50V
C0924 2113741F49 10nF 50V
C0925 2113741F49 10nF 50V
C0926 2113741F17 470pF 50V
C0927 2113741F17 470pF 50V
C0928 2113741F17 470pF 50V
C0929 2113741F17 470pF 50V
C0931 2113741F17 470pF 50V
C0941 2113741F17 470pF 50V
C0951 2113741F17 470pF 50V
C0971 2113741F17 470pF 50V
C0972 2113743A19 100nF 16V
C0973 2113743A19 100nF 16V
C0974 2113741F49 10nF 50V
C0975 2311049A63 TANT CP 10uF 10% 10V
C0976 2113743A19 100nF 16V
C0981 2113743A19 100nF 16V
C0982 2113741F49 10nF 50V
C0983 2311049J23 TANT CP 10uF 10% 6V
C0984 2113743A19 100nF 16V
C0985 2113743A19 100nF 16V
D0971 4813833C02 DUAL SOT MMBD6100
D0981 4805729G73 LED SMT YEL HP
D0982 4805729G74 LED SMT RED HP
D0983 4805729G75 LED SMT GREEN HP
D0984 4805729G75 LED SMT GREEN HP
D0985 4805729G75 LED SMT GREEN HP
D0986 4805729G75 LED SMT GREEN HP
D0987 4805729G75 LED SMT GREEN HP
D0988 4805729G75 LED SMT GREEN HP
D0989 4805729G75 LED SMT GREEN HP
D0990 4805729G75 LED SMT GREEN HP
D0991 4805729G75 LED SMT GREEN HP
D0992 4805729G75 LED SMT GREEN HP
D0993 4805729G75 LED SMT GREEN HP
J0901 2809926G05 CONN 1.25MM 15PIN
J0902 2809926G01 CONN 1.25MM 2PIN
J0903 2809926G01 CONN 1.25MM 2PIN
PB0901 4005840X02 SWITCH
PB0951 4005840X02 SWITCH
PB0952 4005840X02 SWITCH
PB0971 4005840X02 SWITCH
Q0901 4813824A10 NPN 40V .2A B=50-150
Q0902 4813824A10 NPN 40V .2A B=50-150
Q0971 4880048M01 NPN DIG 47k/47k
Q0972 4880048M01 NPN DIG 47k/47k
Q0981 4880048M01 NPN DIG 47k/47k
Q0982 4813824A10 NPN 40V .2A B=50-150
Q0983 4813824A10 NPN 40V .2A B=50-150
Circuit
Ref
Motorola
Part No.
Descritpion
Q0984 4813824A10 NPN 40V .2A B=50-150
Q0985 4813824A10 NPN 40V .2A B=50-150
Q0986 4813824A10 NPN 40V .2A B=50-150
R0901 0662057A01 10 1/16W 5%
R0902 0662057A09 22 1/16W 5%
R0903 0662057A51 1k2 1/16W 5%
R0904 0662057A51 1k2 1/16W 5%
R0906 0662057A47 820 1/16W 5%
R0907 0662057A75 12k 1/16W 5%
R0908 0662057B10 330k 1/16W 5%
R0909 0662057B02 150k 1/16W
R0910 0662057A65 4k7 1/16W 5%
R0911 0662057A57 2k2 1/16W 5%
R0912 0662057A43 560 1/16W 5%
R0913 0662057A43 560 1/16W 5%
R0921 0680194M07 18 1W 5%
R0922 0680194M07 18 1W 5%
R0935 0662057A65 4k7 1/16W 5%
R0936 0662057A65 4k7 1/16W 5%
R0937 0662057A65 4k7 1/16W 5%
R0938 0662057A65 4k7 1/16W 5%
R0945 0662057A65 4k7 1/16W 5%
R0946 0662057A65 4k7 1/16W 5%
R0947 0662057A65 4k7 1/16W 5%
R0948 0662057A65 4k7 1/16W 5%
R0955 0662057A65 4k7 1/16W 5%
R0958 0662057A65 4k7 1/16W 5%
R0964 0662057A65 4k7 1/16W 5%
R0966 0662057A65 4k7 1/16W 5%
R0971 0662057A65 4k7 1/16W 5%
R0972 0662057A65 4k7 1/16W 5%
R0973 0662057A89 47k 1/16W 5%
R0974 0662057A73 10k 1/16W 5%
Circuit
Ref
Motorola
Part No.
Descritpion
R0981 0662057A97 100k 1/16W
R0982 0662057A73 10k 1/16W 5%
R0983 0662057A89 47k 1/16W 5%
R0984 0662057C63 330 1/10W 5%
R0985 0662057A89 47k 1/16W 5%
R0986 0662057C63 330 1/10W 5%
R0987 0662057C63 330 1/10W 5%
R0988 0662057A89 47k 1/16W 5%
R0989 0662057C63 330 1/10W 5%
R0990 0662057C63 330 1/10W 5%
R0991 0662057A89 47k 1/16W 5%
R0992 0662057C63 330 1/10W 5%
R0993 0662057A89 47k 1/16W 5%
R0994 0662057A51 1k2 1/16W 5%
R0995 0662057A73 10k 1/16W 5%
R0997 0662057A73 10k 1/16W 5%
R0998 0660076A25 100 0.125W 5%
R0999 0660076A25 100 0.125W 5%
U0971 5105469E65 IC VLTG REGLTR LP2951C
U0981 5105625U61 IC LCD DRIVER
33 SEGMENT STATIC
U0982 5105625U62 IC XOR QUAD - INPUT
U0983 5113806A35 MC14094, REG, 8-
STAGE,SHIFT/STORE
VR0901 4813830A27 14V 5% 225mW
VR0921 4813830A15 5.6V 5% 225mW
VR0922 4813830A27 14V 5% 225mW
VR0924 4813830A27 14V 5% 225mW
VR0925 4813830A27 14V 5% 225mW
VR0927 4813830A15 5.6V 5% 225mW
VR0928 4813830A15 5.6V 5% 225mW
VR0929 4813830A15 5.6V 5% 225mW
Circuit
Ref
Motorola
Part No.
Descritpion
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
Motorola GM950 is a versatile handheld communication device that offers a range of features to enhance your business operations. With its compact and ergonomic design, it provides reliable and efficient communication on the go. Here are some key capabilities of your new Motorola GM950:
-
Seamless Connectivity: Stay connected with your team and respond promptly to customer needs with the GM950's high-quality voice communication.
-
Clear Audio: Experience crisp and clear audio during calls, ensuring effective and efficient communication, even in noisy environments.
-
Durability: Built to withstand the demands of everyday use, the GM950 features a robust construction that can endure accidental drops and exposure to harsh conditions.
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