HD 458 BT
Table of contents
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HD 458BT
Around-ear headphones
Model: SEBT4
Instruction manual
Use the search function, the navigation (left) or the following links:
Start
“Product overview”
“Getting started”
“Using the headphones”
“FAQ/If a problem occurs ...”
“Specifications”
Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark
Germany
www.sennheiser.com
Version: 06/20 A01
HD 458BT | 1
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.
▷ 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 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. The normal operating tempera
ture is from 0 to 40 °C/32 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 ear cups.
▷ Use only attachments/accessories/spare parts supplied or rec-
ommended by Sennheiser.
▷ Clean the product only with a soft, dry cloth.
▷ Use the product with care and store it in a clean, dust-free envi-
ronment.
Safety instructions for the lithium polymer rechargeable battery
WARNING
If abused or misused, the rechargeable batteries may leak.
In extreme cases, they may even present a risk of:
• heat generation,
• fire development,
•explosion,
•smoke or gas development.
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2 | HD 458BT
Important safety instructions
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 data collection and processing and on firmware updates
This product stores individual settings such as the volume and the
Bluetooth addresses of paired devices. This data is required for the
operation of the product and is not transferred to Sennheiser or com
panies 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:
MAC address, Bluetooth Low Energy UUID, Bluetooth name of the
product, firmware version of the product and version of the app. The
data will only be used as specified and will not be stored perma
-
nently.
If you do not want this data to be transferred and processed, do not
connect to the Internet.
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HD 458BT | 3
Important safety instructions
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 country-specific regulations.
4 | HD 458BT
Package contents
Package contents
HD 458BT around-ear headphones
Model: SEBT4
USB cable with USB-C connector
Analog audio cable with 3.5 mm jack plug
and 2.5 mm jack plug, length approx. 1.5 m
Carry case
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 HD 458BT product
page at
partner: www.sennheiser.com > “Service & Support”.
www.sennheiser.com. Contact your local Sennheiser
HD 458BT | 5
Product overview
Right R
Left L
4
5
6
2
7
A
C
B
9
1
8
0
Product overview
HD 458BT
2
3
Headband
Ear cup joints
Ear cups, steplessly adjustable
On/off button for the headphones and the active noise
cancellation ANC
pressing for 4 seconds activates the Bluetooth pairing
mode
pressing 1x activates/deactivates ANC
LED
Input for analog audio cable;
when a cable is connected, flight mode is activated/Bluetooth is deactivated
USB-C socket for charging
6 | HD 458BT
Product overview
3x
3x
3x
3x
Volume – button (volume down)
Volume + button (volume up)
3-way multi-function button for music and call functions
Voice assistant button
Ear pads
Speech microphones (2 pcs.) for phone calls
Overview of the LED display
During operation
LED Meaning; the headphones
flashes blue 3x switch on
flashes blue are switched on
flashes blue 3x
flashes red/
blue
are connected to a device via Bluetooth
are in Bluetooth pairing mode
are not connected to a device via
flashes red 3x
Bluetooth or the connection has been
lost
flashes purple
3x
ANC is activated/deactivated
During phone calls
LED Meaning
flashes blue Incoming call
Incoming call and the rechargeable
flashes red
battery of the headphones is almost
empty
If the LED does not light up immediately during charging, clean
the charging contacts and charge the headphones until the
LED lights up again (>
11).
HD 458BT | 7
Product overview
Notes on voice prompts
The headphones output voice prompts for various functions (see
examples below).
Voice prompt Meaning/headphones
“Power on” are switched on
“Power off” are switched off
“Device (1) (2) connected” are connected to device 1 or 2
“Lost connection” are not connected via Bluetooth
“Pairing” are in Bluetooth pairing mode
“Call rejected” incoming call rejected
“Call ended” call ended
“More than xx hours
playtime”
Rechargeable battery has the
stated charge level
“Recharge headset” Rechargeable battery is empty.
Recharge the headphones.
Notes on beeps/acoustic signals
The headphones output beeps/acoustic signals for the following
functions.
Acoustic signal Meaning/headphones...
2x low-pitched beep minimum volume is reached
2x low-pitched beep maximum volume is reached
8 | HD 458BT
Getting started
USB-AUSB-C
“Sennheiser Smart Control”
4s
Hold
Getting started
1. Charging the rechargeable battery
The headphones' rechargeable battery is not fully charged upon
delivery. Before using the headphones for the first time, charge the
rechargeable battery for a complete charging cycle without interrup
tion (> 11).
2. Installing the Smart Control app on your
smartphone
The Sennheiser Smart Control app allows you to use all functions
and settings of the headphones and to e.g. adjust the sound to your
liking using the equalizer (>
15).
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3. Connecting the headphones to a Bluetooth
device
Connect the headphones to your smartphone via Bluetooth (> 12).
HD 458BT | 9
Getting started
4. Putting the headphones on and adjusting the
headband
For good sound quality and best possible wearing comfort, the headband can be adjusted to properly fit your head (> 17).
10 | HD 458BT
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