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A full list of safety and warning for Jabra headsets can be found here.

Wireless headsets

Your product is powered by a rechargeable battery.
The full performance of a new battery is achieved only after two or three complete charge and discharge cycles.
The battery can be charged and discharged hundreds of times, but will eventually wear out.
Unplug the charger from the electrical plug and the product when not in use.
Do not leave a fully charged battery connected to a charger, since overcharging may shorten its lifetime.
If left unused, a fully charged battery will lose its charge over time.
Leaving the product in hot or cold places, such as in a closed car in the summer and winter conditions, will reduce the capacity and lifetime of the battery.
Always try to keep the battery between 15°C and 25°C (59°F and 77°F). A product with a hot or cold battery may not work temporarily, even when the battery is fully charged. Battery performance is particularly limited in temperatures well below freezing.

”Caution” – The battery used in this product may present a risk of fire or chemical burn if mistreated.
Do not attempt to open the product or replace the battery. It is built-in and not changeable. Use of other batteries may present a risk of fire or explosion and the warranty will be terminated.
Only recharge your battery with the provided approved chargers designated for this product.
Dispose of batteries according to local regulations. Please recycle when possible. Do not dispose as household waste or in a fire as they may explode.
Batteries may explode if damaged.

Do not attempt to charge your headset with anything other than the AC adapter provided. The use of any other types may damage or destroy the headset and could be dangerous. Use of other chargers may invalidate any approval or warranty. For availability of approved enhancements, please check with your dealer.
Charge the product according to the instructions supplied with the product.
Important: Please refer to the user manual for a description of the charging status indicator lights. Some headsets cannot be used while charging.

“Caution” – Ensure that the charger is installed to be easily accessible and please be cautious when you disconnect the power cord or any enhancement, grasp and pull the plug, not the cord. Never use a charger that is damaged.
Do not attempt to disassemble the charger as it may expose you to dangerous electric shock. Incorrect reassembly can cause electric shock or fire when the product is subsequently used.
Avoid charging your headset in extremely high or low temperatures and do not use the charger outdoors or in damp areas.