Sennheiser FLX 70 Instruction Manual page 5

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 batter-
ies 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 cau-
se harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installa-
tion.
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
present
Please understand that Sennheiser Communications does not accept
liability for damage arising from abuse or misuse.
4
a heat hazard
a fire hazard
an explosion hazard
a smoke and gas hazard