78 | Tourguide 2020-D
Important safety instructions
permissible volume which is by law (in some countries) allowed to affect your
hearing for the duration of a working day� It is used as a basis according to the
specifications of industrial medicine� Higher volumes or longer durations can
damage your hearing� At higher volumes, the duration must be shortened in
order to prevent hearing damage�
The following are sure signs that you have been subjected to excessive noise
for too long a time:
• You can hear ringing or whistling sounds in your ears�
• You have the impression (even for a short time only) that you can no longer
hear high notes�
Inform all users of these risks and ask them to set the volume to a moderate
level if necessary�
Intended use
The product is designed for indoor and outdoor use�
The product can be used for commercial purposes�
It is considered improper use when the product is used for any application not
named in the corresponding instruction manual�
Sennheiser does not accept liability for damage arising from improper use or
misuse of this product and its attachments/accessories�
Before putting the products into operation, please observe the respective
country-specific regulations!
Sennheiser is not liable for damages resulting from the loss of connection
due to flat or overaged (rechargeable) batteries or exceeding the transmission
range�
Safety instructions for standard/rechargeable batteries
• Caution: Risk of explosion if you use or replace a battery by an incorrect
type�
• Do not short-circuit a cell or battery�
• Do not expose cells or batteries to heat or fire� Avoid storage in sunlight�
• Do not subject cells or batteries to mechanical shock�
• Do not touch leaking/defective batteries unprotected�
• Observe correct polarity�
• Do not use different battery types�
• Charge rechargeable batteries at ambient temperatures b10 °C
and +40 °C (+50 °F and +104 °F)�