Bosean Electronic Technology BH-90E, Operation Manual

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personal change may affect its normal use. If for any specific use you
need to use this function, please contact the seller to get the password
first.

About Default : You may need to restore factory setting in case of wrong
operation or gas calibration error. Please contact the seller to get the
password first if it’s needed.
When you see low battery alert or when the detector can’t turn on
because battery voltage is too low, please charge the detector in time
(see below).


4.5 Charging
First, make sure the detector is off, then connect the charger to the 220V AC
power source: the detector will turn on automatically, the screen will indicate
“Charging”. When screen displays “Full!”, it means charging is completed.
WARNING!!!

It’s impossible to turn on the detector when it’s off and being charged.