Important safety instructions
2 | MOMENTUM 4
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. Head-
phones of the Sennheiser brand sound exceptionally even 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). 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 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 Sonova Consumer Hearing.
▷Clean the product only with a soft, dry cloth.
Safety instructions for Lithium rechargeable batteries
WARNING
If abused or misused, rechargeable batteries may leak. In
extreme cases, they may even present a risk of:
• explosion,
• heat and fire development
• smoke and/or gas development
• damage to health and/or the environment
