We have designed this product to give you reliable operation over many years. Over half a
century of accumulated expertise in the design and manufacture of high-quality electro-acoustic
equipment have made Sennheiser a world-leading company in this field.
Please take a few moments to read these instructions carefully, as we want you to enjoy your
new Sennheiser product quickly and to the fullest.
1
Important safety instructions
The FLX 70 has been manufactured according to the accepted rules of safety and current technology. However,
there is still a danger of damage to equipment if the following general safety instructions are not complied with.
• Read these instructions.
• Follow these instructions.
• Keep these instructions in a location where they are accessible to all
users at all times.
• Always include the operating instructions when you pass the FLX 70
on to third parties.
Intended use
The FLX 70 is an accessory for mobile phones or any Bluetooth compliant device with a “hands free” or a “headset” profile intended for wireless communication via Bluetooth in dry environments.
It is considered improper use when the FLX 70 is used
• for any application not named in these instructions,
• under operating conditions that deviate from those described in these
instructions.
To avoid damage to your hearing
• Set a low volume setting before inserting the earphone!
• Do not use the earphone for long periods of time with a high volume
setting!
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To avoid damage to your auditory canals and eardrum:
• Place a suitable earbud on the earphone (S, M or L). Never insert the
earphone without pads!
• Always insert and remove the earphone from the auditory canal
slowly and carefully! Do not insert the earphone too far into the ear!
• Always keep the earphone dry.
To prevent accidents
• Do not use the headset in environments in which particular attention
must be paid (e.g. on roads or while carrying out manual work).
General instructions
• Never disassemble or modify components of the FLX 70.
• The built-in rechargeable battery may present a fire or chemical burn
hazard if mistreated. Therefore, do not disassemble, heat above 40 °C
(104 °F) or incinerate the rechargeable battery.
• Sennheiser Communications is not liable for damages resulting from
the loss of connection due to a run flat battery, an old battery or exceeding the transmitting range.
Before operation
• Use the FLX 70 in dry places only and keep liquids and small electri-
cally conductive parts away from the FLX 70 and its connecting sockets.
• Do not expose the FLX 70 to extreme temperatures. Normal operating
temperatures are 10 °C (50 °F) to 40 °C (104 °F).
• Store the headset in a clean, dust-free environment.
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During charging
• Do not wear the headset when charging.
• Sennheiser Communications is not liable for damages to USB devices
that are not consistent with the USB specifications.
• The headset must be charged either with the FLX 70 power supply
(EU: 502310, UK: 502311, US: 502312), the FLX 70 car charger unit
(502313) or a USB socket of a computer. Never try to charge batteries other than the one in the FLX 70 headset with the FLX 70 power
supply or the FLX 70 car charger unit.
During operation
• This equipment generates, uses and can radiate radio frequency
energy and, if not used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
Safety instructions for Lithium-Polymer rechargeable batteries
The FLX 70 has a built-in Lithium-Polymer rechargeable battery. If
abused or misused, rechargeable batteries may leak.
WARNING! In extreme cases, rechargeable batteries may even
Please understand that Sennheiser Communications does not accept
liability for damage arising from abuse or misuse.
present
• a heat hazard
• a fire hazard
• an explosion hazard
• a smoke and gas hazard
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