Sennheiser M3IETW, M3IETW L, M3IETW R, M3IETW C Instruction Manual
MOMENTUM True Wireless
True wireless stereo earphones
Model: M3IETW (M3IETW L, M3IETW R, M3IETW C)
Instruction manual
Use the search function, the navigation (left) or the following links:
Start
“Product overview”
“Getting started”
“Using the earphones”
“FAQ/If a problem occurs ...”
“Specifications”
Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark
Germany
www.sennheiser.com
Version: 11/20 A03
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 pace
makers, 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. Swallowing and chok
ing hazard.
▷ Do not use the product in an environment that requires your spe-
cial attention (e.g. in traffic or when performing skilled jobs).
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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 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.
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Important safety instructions
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.
Do not heat above 60 °C/140 °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.
Notes on data collection and processing and on firmware updates
This product stores individual settings such as the volume, the
sound profiles and the Bluetooth connection data of paired devices.
This data is required for the operation of the product and is not trans
ferred to Sennheiser or companies commissioned by Sennheiser and
is not processed.
Using the “Sennheiser Smart Control” app, you can update the firmware of the product for free via an Internet connection. If the device
on which the app is installed is connected to the Internet, the follow
ing data is automatically transferred to and processed by Sennheiser
servers in order to provide and transfer suitable firmware updates:
hardware identifier, hardware revision number, firmware version of
the product, type of the operating system (Android, iOS), version of
the operating system and version of the app. The data will only be
used as specified and will not be stored permanently.
If you do not want this data to be transferred and processed, do not
connect to the Internet.
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/acces
sories.
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.
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Package contents
Package contents
Earbud R for right ear (M3IETW R) and
earbud L for left ear (M3IETW L)
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
Quick guide
Safety guide
Online you can find:
• this detailed instruction manual and additional information
(www.sennheiser.com/download)
• the Sennheiser Smart Control app for configuring the headphones and for additional functions
(www.sennheiser.com/smartcontrol)
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 > “Service &
Support”.
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Product overview
1 2 394 5
7
7
8
6
Product overview
Charging case
M3IETW C
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)
Input for USB-C connector
for charging the rechargeable batteries
LED button
activates the LED display for 5 seconds
Built-in rechargeable battery for charging the earbuds on
the go
Type plate
Charging compartment for the left earbud L
Magnetic holders
Charging compartment for the right earbud R
Charging contacts
MOMENTUM True Wireless | 5
Product overview
R
L
CC
A
M3IETW L M3IETW R
A
DDE
F
00
F
F
G
B
D
DE
H
H
Earbuds
M3IETW L and M3IETW R
Touch control panel
Changeable silicone ear adapters
Left earbud L (secondary earbud, receives signals from the
right earbud)
Status LED
Magnetic holders
Charging contacts
Microphones for the perception of ambient noise
(“Transparent Hearing”) and for phone calls
Right earbud R (primary earbud, controls the Bluetooth
connection to the smartphone and to the left earbud)
Built-in rechargeable battery
Overview of the LED indications of the charging case
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When a USB cable is connected, the LED of the charging case permanently displays the charging process:
Product overview
2
Press
1x
LED
pulses
yellow
lights up
green
flashes
red
Charging case WITH
earbuds inserted
... earbuds and
charging case are
being charged
... earbuds and
charging case are
fully charged
... a charging error/
battery error has
been detected in at
least one earbud (>
26)
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 (>
26)
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:
Charging case
WITHOUT earbuds
inserted
... charging case is
charged between
50-100 %
LED
lights up
green
Charging case WITH
earbuds inserted
... earbuds are fully
charged
... earbuds are being
pulses
yellow
charged via the
rechargeable bat
-
tery of the charging
–
case
... rechargeable bat-
lights up
yellow
tery of the charging
case is empty and
the earbuds are not
... charging case is
charged less than
50
%
fully charged
... rechargeable batlights up
red
teries of the earbuds
and the charging
case are empty
... a charging error/
flashes
red
battery error has
been detected in at
least one earbud (>
26)
... rechargeable battery of the charging
case is empty
... a charging error/
battery error has
been detected in the
charging case (>
26)
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Product overview
3x
3x
If the LED does not light up:
• Clean the contacts on the earbuds and in the charging case
(>
25).
• Charge the rechargeable batteries of the earbuds and the
charging case until the LED lights up again (>
12).
Overview of the LED indications of the earbuds
LED Meaning; earbuds ...
flashes red-blue
for approx. 1 min
flashes blue 3
times
flashes red 3
times
lights up blue
lights up red
flashes red
quickly
flashes red
slowly
... in Bluetooth pairing mode
... Bluetooth pairing successful
... Bluetooth pairing failed
... are connected to a device via
Bluetooth
(primary earbud (R) is connected to
the smartphone, secondary earbud
(L) is connected to the primary
earbud (R))
... are not connected to a device via
Bluetooth or the connection has
been lost
(primary earbud (R) is not connected
to a smartphone, secondary earbud
(L) is not connected to the primary
earbud (R))
... rechargeable battery is almost
empty
... system error. Perform a restart >
28).
When you insert the earbuds into your ears, the LEDs of the
earbuds automatically go off after approx. 5 seconds.
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Product overview
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/earbuds...
“Power on” ... are switched on
“Power off” ... switch off
“Connected” ... connected via Bluetooth
“No connection” ... not connected via Bluetooth
“Pairing” ... in Bluetooth pairing mode
“Pairing cancelled” ... Bluetooth pairing cancelled
“Pairing successful” ... Bluetooth pairing successful
“Pairing failed” ... Bluetooth pairing not successful
“Recharge headset” ... rechargeable battery almost
empty – recharge the battery
“Call rejected” ... incoming call rejected
“Call ended” ... call ended
“Volume min” ... volume set to minimum
“Volume max” ... volume set to maximum
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Getting started
“Sennheiser Smart Control”
Getting started
1. Waking up the earphones and the charging
case and charging the rechargeable batteries
Upon delivery, the rechargeable batteries of the earphones and the
charging case are in sleep mode and have to be woken up by con
necting them to a power source once.
▷ Insert the earphones into the charging case.
▷ Connect the USB-C cable to the charging case and to a USB
power source (>
The earphones and the charging case are woken up and the
rechargeable batteries are being charged. The earphones are
now ready for use.
12).
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2. Installing the Smart Control app on your
smartphone
The Sennheiser Smart Control app allows you to use all functions
and settings of the earphones and to e.g. adjust the sound to your
liking using the equalizer (>
15).
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