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Important safety instructions
2 | HD 250BT
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).
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.
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.
2


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