1.Adopt U type handle to prevent the accident. 2.Stainless steel crust, never rust 3.Adopt metal material for both sides of crust to prevent unsafe hidden trouble of plastic 4. No motor inside the mortise: change the deadly disfigurement of motor at all 5. Free rotating handle, prolongs mechanism life the furthest and also avoids unlocking by violence 6. Pure stainless steel mechanical rotating structure enables its life to be more than 10 years 7. Change batteries in the lock most easily and safely 8. Adopt plastic insulated protection on electronic part
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