Sennheiser Electronic M3IETWR User Manual
MOMENTUM True Wireless
True wireless stereo earphones
M3IETW (M3IETW L, M3IETW R, M3IETW C)
Instruction manual
Use the navigation (left) or the following links:
“Product overview”
“Getting started”
“Using the earphones”
“FAQ/If a problem occurs ...”
“Specifications”
Version: 08/18 A01
Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark
Germany
www.sennheiser.com
Contents
Contents
Important safety instructions 3
Package contents 5
Product overview 6
Charging case 6
Earbuds 6
Overview of the LED indications of the charging case 7
Overview of the LED indications of the earbuds 8
Getting started 10
Using the earphones 11
Information on the rechargeable battery, the charging process
and the first use 11
Charging the rechargeable battery of the earbuds and the
charging case 11
Connecting the earphones to a Bluetooth device 12
Information on the Bluetooth wireless connection 12
Pairing the earbuds with a Bluetooth device 12
Disconnecting the earphones from a Bluetooth device 13
Installing the Smart Control app 13
Selecting suitable ear adapters for optimum fit of the earbuds 13
Inserting the earbuds into the ears 14
Switching the earbuds on 14
Switching the earbuds off 14
Adjusting the volume 15
Listening of ambient noise or conversations - activating/deactivating the Transparent Hearing function 15
Adjusting the Transparent Hearing function 16
Using the voice assistant/voice dialing 16
Using the Smart Pause function 16
Controlling music playback 16
Making calls using the earphones 17
Displaying the battery charge status 17
Adjusting sound effects/the equalizer 18
Setting the voice prompts/beep sounds 18
Storing or transporting the earphones in the charging case 18
Care and maintenance 20
Changing ear adapters 20
Information on the built-in rechargeable battery 20
Installing firmware updates 20
FAQ/If a problem occurs ... 21
Specifications 23
Manufacturer Declarations 24
2 | MOMENTUM True Wireless
Important safety instructions
Important safety instructions
▷ Read this instruction manual carefully and completely before
using the product.
▷ Always include this instruction manual when passing the product
on to third parties.
▷ Do not use an obviously defective product.
▷ Only use the product in environments where Bluetooth wireless
transmission is permitted.
Preventing damage to health and accidents
▷ Protect your hearing from high volume levels. Permanent hearing
damage may occur when headphones are used at high volume
levels for long periods of time. Sennheiser headphones sound
exceptionally good at low and medium volume levels.
▷ Do not insert the earphones too deep into your ears and never
insert them without ear adapters. Always remove the earphones
slowly and carefully from your ears.
▷ The product generates stronger permanent magnetic fields that
could cause interference with cardiac pacemakers, implanted
defibrillators (ICDs) and other implants. Always maintain a distance of at least 3.94"/10 cm between the product component
containing the magnet (earbuds and charging case) and the cardiac pacemaker, implanted defibrillator, or other implant.
▷ Keep the product, accessories and packaging parts out of reach
of children and pets to prevent accidents and choking hazards.
▷ Do not use the product in an environment that requires your spe-
cial attention (e.g. in traffic or when performing skilled jobs).
Preventing damage to the product and malfunctions
▷ Always keep the product dry and do not expose it to extreme tem-
peratures (hairdryer, heater, extended exposure to sunlight, etc.)
to avoid corrosion or deformation.
▷ Use only attachments/accessories/spare parts supplied or rec-
ommended by Sennheiser.
▷ Clean the product only with a soft, dry cloth.
Safety instructions for Lithium-Polymer rechargeable batteries
WARNING
If abused or misused, the rechargeable batteries may leak. In
extreme cases, they may even present a risk of
• explosion,
• fire development,
• heat generation,
• smoke or gas development.
Only use rechargeable batteries and chargers
recommended by Sennheiser.
Charge products with built-in rechargeable batteries at
ambient temperatures between 10 and 40°C/50 and
104°F.
MOMENTUM True Wireless | 3
Important safety instructions
Do not heat above 70°C/158°F, e.g. do not expose to
sunlight or throw into fire.
When not using the product for extended periods of
time, charge its built-in rechargeable battery regularly
(about every 3 months).
Switch rechargeable battery-powered products off after
use.
Dispose of defective products with built-in rechargeable
batteries at special collection points or return them to
your specialist dealer.
Note on firmware updates
Make sure that your headphones are always updated to the latest
firmware.
Firmware updates can be downloaded free of charge from the Internet using the Sennheiser Smart Control app.
Intended use/Liability
These headphones have been designed as an accessory for Bluetooth compliant devices. They are intended for wireless audio communication such as music playback and phone calls via Bluetooth
wireless technology.
It is considered improper use when the product is used for any application not named in the corresponding product documentation.
Sennheiser does not accept liability for damage arising from
improper use or misuse of this product and its attachments/accessories.
Sennheiser is not liable for damages to USB devices that are not consistent with the USB specifications. Sennheiser is not liable for damages resulting from the loss of connection due to flat or overaged
rechargeable batteries or exceeding the Bluetooth transmission
range.
Before putting into operation, please observe the respective country-specific regulations.
4 | MOMENTUM True Wireless
Package contents
Right earbud R (M3IETW R) and left earbud L
(M3IETW L), each with built-in rechargeable battery
Charging case with built-in rechargeable battery for
the earbuds (M3IETW C)
USB charging cable with USB-C and USB-A connector, approx. 0.25 m
Silicone ear adapters (size XS, S, M (pre-mounted to
the earphones) and L
Package contents
Quick guide
Safety guide
Online you can find:
• a detailed instruction manual (www.sennheiser.com/download)
• the Sennheiser Smart Control app for configuring the earphones
and for additional functions (www.sennheiser.com/device-control-app)
A list of accessories can be found on the MOMENTUM True
Wireless product page at www.sennheiser.com. Contact your
local Sennheiser partner: www.sennheiser.com > “Sales Partner”.
MOMENTUM True Wireless | 5
Product overview
Product overview
Charging case
M3IETW C
1 Type plate
2 LED
displays the charging process/charge status of the rechargeable
battery of the charging case or of the earbuds (when inserted into
the charging case)
3 LED button
activates the LED display for 5 seconds
4 Built-in rechargeable battery for charging on the go
5 Input for USB-C connector
for charging the rechargeable batteries
6 Charging compartment for the left earbud L
7 Charging compartment for the right earbud R
8 Magnetic holders
0 Charging contacts
Earbuds
M3IETW L and M3IETW R
6 | MOMENTUM True Wireless
A Right earbud R (master earbud, controls the Bluetooth connec-
tion to the smartphone and to the left earbud)
B Right touch control panel
Product overview
C left earbud L (slave earbud, receives Bluetooth signals from the
right earbud)
D Left touch control panel
E Status LED
F Charging contacts
G Magnetic holders
H Changeable silicone ear adapters
I Microphones for phone calls
J Microphones for the perception of ambient noise (“Transparent
Hearing”)
Overview of the LED indications of the charging case
When a USB cable is connected, the LED of the charging case permanently displays the charging process:
LED
pulses
yellow
lights up
green
flashes red ... a charging error/battery
If you press the LED button and no USB cable is connected, the LED
of the charging case displays the battery charge status or the
charging process of the earbuds for 5 seconds:
LED
lights up
green
pulses
yellow
lights up
yellow
Charging case WITH
earbuds inserted
... earbuds and charging
case are being charged
... earbuds and charging
case are fully charged
error has been detected in
at least one earbud (see
page 20)
Charging case WITH
earbuds inserted
... the earbuds are fully
charged
...the earbuds are being
charged via the
rechargeable battery of
the charging case
... the rechargeable battery
of the charging case is
empty and the earbuds are
not fully charged
Charging case WITHOUT
earbuds inserted
... charging case is being
charged
...charging case is fully
charged
... ... a charging error/
battery error has been
detected in the charging
case (see page 20)
Charging case WITHOUT
earbuds inserted
... the charging case is
charged between
50-100 %
–
... the charging case is
charged less than 50 %
MOMENTUM True Wireless | 7
Product overview
LED
lights up
red
flashes red ... a charging error/battery
Charging case WITH
earbuds inserted
... the rechargeable
batteries of the earbuds
and the charging case are
empty
error has been detected in
at least one earbud (see
page 20)
Charging case WITHOUT
earbuds inserted
... the rechargeable
battery of the charging
case is empty
... ... a charging error/
battery error has been
detected in the charging
case (see page 20)
Overview of the LED indications of the earbuds
LED Meaning; the earbud ...
flashes red-blue
for approx. 1 min
flashes blue 3
times
flashes red 2
times
lights up blue ... is connected to a device via Bluetooth
lights up red ... is not connected to a device via Bluetooth or
flashes red
quickly
flashes red
slowly
... is in Bluetooth pairing mode
... Bluetooth pairing successful
... Bluetooth pairing failed
(master earbud (R) is connected to the
smartphone, slave earbud (L) is connected to
the master earbud (R))
the connection has been lost
(master earbud (R) is not connected to a
smartphone, slave earbud (L) is not connected
to the master earbud (R))
... rechargeable battery is almost empty
... system error. Perform a restart (see page 22).
8 | MOMENTUM True Wireless
When you insert the earbuds into your ears, the LEDs of the
earbuds automatically go off after approx. 5 seconds.
Notes on voice prompts
The earphones output voice prompts for the following functions.
Using the Smart Control app, you can change the language of the
voice prompts, choose between voice prompts and beep sounds, or
deactivate the status messages with a few exceptions (e.g.
rechargeable battery is empty).
Voice prompt Meaning/earbud...
“Power on” ... switched on
“Power off” ... switched off
“Connected” ... connected via Bluetooth
“No connection” ... not connected via Bluetooth
“Pairing” ... is in Bluetooth pairing mode
“Pairing cancelled” ... Bluetooth pairing cancelled
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