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Adopt U type handle to prevent the accident.
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Stainless steel crust, never rust.
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Adopt metal material for both sides of crust to prevent unsafe hidden trouble of plastic.
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Don't install the motor inside the mortise: change the deadly disfigurement of motor at all.
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Free rotating handle, maximum prolong mechanism life and also avoid unlock by violence.
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Pure stainless steel mechanical rotating structure enable for using more than 10 years.
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Change batteries in the lock most easily and safely.
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Adopt plastic insulated protection on electronic part.