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MOMENTUM True Wireless 2
True wireless stereo earphones
M3IETW2, M3IETW2 R, M3IETW2 L, M3IETW2 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: 04/20 A01
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 the product if it is obviously defective or makes loud, unusual (whistling or beeping) noise.
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. Swallowing and choking hazard.
Do not use the product in an environment that requires your special attention (e.g. in traffic). Especially the product’s active noise cancellation can make ambient noise inaudible or drastically change the perception of acoustic warning signals.
Preventing damage to the product and malfunctions
Always keep the product dry and do not expose it to extreme temperatures (hairdryer, heater, extended exposure to sunlight, etc.) to avoid corrosion or deformation. The normal operating temperature is from 0 °C to 40 °C/32 °F to 104 °F.
To avoid loud, unusual (whistling or beeping) noise and to ensure proper noise cancellation, do not cover the microphone openings of the active noise cancellation circuitry located on the outside of the earbuds.
Use only attachments/accessories/spare parts supplied or recommended by Sennheiser.
Clean the product only with a soft, dry cloth.
2 | MOMENTUM True Wireless 2
Important safety instructions
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.
Only use rechargeable batteries and chargers recommended by Sennheiser.
Only charge the product / rechargeable batteries at ambient temperatures between 10 °C to 40 °C/50 °F to 104 °F.
Do not heat the product / rechargeable batteries above 70 °C/140 °F. Avoid exposure to sunlight and do not throw the product / rechargeable batteries into fire.
When not using the product / rechargeable batteries for extended periods of time, charge them regularly (about every three 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 the ingress protection rating of the earphones
The earphones feature an IPX4 ingress protection rating which means they are protected from the ingress of water (protection class according to International Protection Marking (IP code), IEC standard 60529, tested under laboratory conditions).
The earbuds can be used in the rain, for example. However, they are not suitable for immersion in water or for wearing in the shower. In case of permanent moisture/wetness, the ingress protection can be reduced and the product can be damaged.
Do not charge wet earbuds. Completely dry wet earbuds with a dry cloth before charging them.
The charging case is not splash waterproof. Always keep the charging case dry.
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 transferred to Sennheiser or companies commissioned by Sennheiser and is not processed.
MOMENTUM True Wireless 2 | 3
Important safety instructions
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 following 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, operating system type (Android, iOS) and version, 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 misuse or improper use 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 coun- try-specific regulations.
4 | MOMENTUM True Wireless 2
Package contents
Package contents
Earbud R for right ear (M3IETW2 R) and earbud L for left ear (M3IETW2 L)
Charging case (M3IETW2 C) with
built-in rechargeable battery for the earbuds
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 earbuds) 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 2 product page at www.sennheiser.com.
Contact your local Sennheiser partner: www.sennheiser.com > “Service & Support”.
MOMENTUM True Wireless 2 | 5
Product overview
Product overview
Charging case
M3IETW2 C
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6 8
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1 2 3 4 5 
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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
6 | MOMENTUM True Wireless 2
Product overview
Earphones
M3IETW2 R and M3IETW2 L
M3IETW2 L
B
A
L |
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E F
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M3IETW2 R |
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H |
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C |
C |
A |
D D |
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R |
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0
E E F E
I G
G
Touch control panel
Changeable silicone ear adapters
Left earbud L (slave earbud, receives signals from the right earbud)
Status LED
Infra-red carrying senor
Magnetic holders
Charging contacts
Microphones for the active noise cancellation ANC, for the perception of ambient noise (“Transparent Hearing”) and for phone calls
Right earbud R (master earbud, controls the Bluetooth connection to the smartphone and to the left earbud)
Built-in rechargeable battery
MOMENTUM True Wireless 2 | 7
Product overview
Overview of the LED indications of the charging case
2
When a USB cable is connected, the LED of the charging case permanently displays the charging process:
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Charging case WITH |
Charging case |
LED |
WITHOUT earbuds |
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earbuds inserted |
inserted |
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pulses |
... earbuds and |
... charging case is |
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charging case are |
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yellow |
being charged |
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being charged |
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lights up |
... earbuds and |
... charging case is |
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charging case are |
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green |
fully charged |
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fully charged |
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... a charging error/ |
... a charging error/ |
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battery error has |
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flashes |
battery error has |
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been detected in at |
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red |
been detected in the |
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least one earbud (> |
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charging case (> 34) |
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34) |
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1x
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:
8 | MOMENTUM True Wireless 2
Product overview
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Charging case WITH |
Charging case |
LED |
WITHOUT earbuds |
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earbuds inserted |
inserted |
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... earbuds are fully |
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lights up |
charged and the |
... charging case is |
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charging case can |
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green |
fully charged |
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still charge at least |
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one complete cycle |
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... earbuds are being |
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pulses |
charged via the |
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rechargeable bat- |
– |
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yellow |
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tery of the charging |
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case |
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... earbuds are fully |
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charged, the |
... charging case is |
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lights up |
charging case |
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charged less than |
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yellow |
cannot charge |
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90 % |
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another complete |
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cycle |
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... rechargeable bat- |
... rechargeable bat- |
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lights up |
teries of the earbuds |
tery of the charging |
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red |
and the charging |
case is empty |
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case are empty |
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... a charging error/ |
... a charging error/ |
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battery error has |
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flashes |
battery error has |
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been detected in at |
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red |
been detected in the |
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least one earbud (> |
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charging case (> 34) |
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34) |
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If the LED does not light up:
•Clean the contacts on the earbuds and in the charging case (> 33).
•Charge the rechargeable batteries of the earbuds and the charging case until the LED lights up again (> 15).
Overview of the LED indications of the earbuds
MOMENTUM True Wireless 2 | 9
Product overview
LED |
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...Meaning; the earbuds |
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flashes red-blue |
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for approx. 1 |
... are in Bluetooth pairing mode |
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minute |
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3x |
flashes blue 3x |
... Bluetooth pairing or earbud pair- |
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ing successful |
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3x |
flashes red 3x |
... Bluetooth pairing or earbud pair- |
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ing failed |
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... are connected to a device via |
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lights up blue |
Bluetooth |
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(master earbud (R) is connected to |
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the smartphone, slave earbud (L) is |
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connected to the master earbud (R)) |
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... are not connected to a device via |
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Bluetooth or the connection has |
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lights up red |
been lost |
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(master earbud (R) is not connected |
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to a smartphone, slave earbud (L) is |
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not connected to the master earbud |
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(R)) |
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flashes red |
... rechargeable battery is almost |
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quickly |
empty |
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flashes red |
... system error – the Smart Control |
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app may display details. Perform a |
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slowly |
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restart (> 35). |
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flashes red- |
... are in earbud pairing mode (to pair |
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green for |
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the right and left earbud) |
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approx. 1 minute |
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When you insert the earbuds into your ears, the LEDs of the earbuds automatically go off.
Notes on voice prompts
The earphones output voice promtps for events (the table gives some examples). 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 |
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“Power off” |
... switch off |
“Connected” |
... connected via Bluetooth |
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“No connection” |
... not connected via Bluetooth |
“Pairing” |
... in Bluetooth pairing mode |
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“Pairing cancelled” |
... Bluetooth pairing cancelled |
“Pairing successful” |
... Bluetooth pairing successful |
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“Pairing failed” |
... Bluetooth pairing not successful |
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10 | MOMENTUM True Wireless 2
Product overview
Voice prompt |
Meaning/earbuds... |
“Recharge headset” |
... rechargeable battery is almost |
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empty. Recharge the rechargeable |
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battery. |
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“Call rejected” |
... incoming call rejected |
“Call ended” |
... call ended |
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“Volume min” |
... volume set to minimum |
“Volume max” |
... volume set to maximum |
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MOMENTUM True Wireless 2 | 11
Getting started
Getting started
1. Waking up the earbuds and the charging case and charging the rechargeable batteries
LR
USB-C
USB-A
Upon delivery, the rechargeable batteries of the earbuds and the charging case are in sleep mode and have to be woken up by connecting them to a power source once.
Insert the earbuds into the charging case.
Connect the USB-C cable to the charging case and to a USB power source (> 15).
The earbuds and the charging case are woken up and the rechargeable batteries are being charged. The earbuds are now ready for use.
Alternatively:
Press and hold the LED button on the charging case for 3 seconds.
The earbuds and the charging case are woken up and can now be used.
2. Selecting suitable ear adapters for optimum fit of the earbuds
XS S M L
L
R
L
The perceived sound quality including bass performance and the best possible noise cancellation of the earphones depends to a large extent on the correct fit of the earbuds in the ear.
Test which ear adapter size gives you the best sound quality and the best wearing comfort.
12 | MOMENTUM True Wireless 2
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