Walgreens WGNBPW-710 - Replace the batteries if:

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Replace the batteries if:
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switched on.
As the supplied batteries are for test only, they may
be discharged earlier than batteries you buy in stores.
Replace all batteries at one time (as simultaneous set).
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time. Date and time will need to be reset if batteries are
removed or replaced. Clean contacts on battery and in
battery compartment with a soft dry cloth each time you
install batteries.
Note:
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together with the household garbage.