Operating and storage temperatures
Place the BlackBerry Universal Headset or BlackBerry Universal Headset accessories away from heat sources, such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. If you are not going to use the headset for more than 2 weeks, turn off the power.
Follow the operating and storage temperatures listed below:
OPERATING OUTSIDE OF THIS TEMPERATURE RANGE CAN IMPAIR AUDIO QUALITY AND CAUSE BATTERY DAMAGE.
STORING OUTSIDE OF THIS TEMPERATURE RANGE CAN CAUSE BATTERY DAMAGE.