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The environment temperature required by the battery is -20℃-60℃ (the ideal value is 35℃)，the
relative humidity is 5℃-95℃（the ideal value is 55℃），the battery life can reach 18 months.
Q15: I feel my E5331 getting hot after long hours usage. Is there safety concern?
A:
Like most other electronic devices, E5331 get hotter during charge or big data transfer. It is a quite
normal phenomenon if working in regular office environment. Even if it worked in hot environment,
E5331 will automatically power off if its temperature reach 157 ℉ (69 ℃) for safety protection.
(Please don’t use E5331 in close environment; it will cause poor signal and high heat of your E5331).
Q16: How can I enter into forced downloading mode？
A:
When your computer can't recognize E5331, that means you can’t see new ports or new network
card come out in Device Manager, in this case, you can use forced download to upgrade.
In the power off mode, press and hold ―Power‖ and ―Reset‖ at least 5 seconds (hold ―Reset‖ first)
then you can see all LED indictors are coruscated, now release press ―Reset‖ key again. After all the
LED indictors has coruscated run one key update again to update firmware.
Q17: How can I get version information of my E5331？
A:
Click " ",
then you can see software & hardware version of your E5331.
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General
Weight and Dimensions
