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2 | MB 660
Important safety instructions
Important safety instructions
X Read this instruction manual carefully and completely
before using the product.
X Do not use an obviously defective product.
X Only use the product in environments where wireless
Bluetooth® transmission is permitted.
X Before putting the product into operation, please
observe the respective country-specific regulations!
Preventing damage to health and accidents
X Do not listen at high volume levels for long
periods of time to prevent hearing damage.
X Always maintain a distance of at least 3.94“ (10 cm)
between the ear cups and the cardiac pacemaker or
implanted defibrillator since the product generates
permanent magnetic fields.
X Keep the product, accessories and packaging parts out
of reach of children and pets to prevent accidents and
choking hazards.
X Do not use the product in situations which require special
attention (e.g. in traffic).
Preventing damage to the product and malfunctions
X Always keep the product dry and do not expose it to
extreme temperatures (heater, extended exposure to
sunlight, etc.) to avoid corrosion or deformation.
X Only use attachments/accessories/spare parts supplied
or recommended by Sennheiser.
X Only clean the product with a soft, dry cloth.
X Use the product with care and store it in a clean, dust-
free environment.
Safety instructions for the Lithium-Polymer battery pack
WARNING
In extreme cases, abuse or misuse of Lithium-
Polymer battery pack can lead to:
explosion
fire
heat
smoke or gas
Only use rechargeable batteries recommended by
Sennheiser and the appropriate chargers.
Do not expose to moisture.
Switch rechargeable battery-powered products off
after use.
Only charge rechargeable batteries at ambient
temperatures between 10 °C/50 °F and
40 °C/104 °F.
When not using rechargeable batteries for
extended periods of time, charge them regularly
(about every 3 months).
Do not mutilate or dismantle.
Do not heat above +60 °C/140 °F, e.g. do not
expose to sunlight or throw into a fire.
Dispose of defective products with built-in
rechargeable batteries at special collection points or
return them to your specialist dealer.
Intended use/Liability
This wireless headset is an accessory for mobile phones
or any Bluetooth® compliant device supporting profiles
(e. g. “Hands-Free Profile” - HFP). It is intended for wireless
communication via Bluetooth connection.
It is considered improper use when this product is used
for any application not named in the associated product
guides.
Sennheiser does not accept liability for damage arising
from abuse 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 over aged rechargeable
batteries or exceeding the Bluetooth transmission range.
3


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